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      Class 12 MATHS – JEE

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      • Class 12
      • Class 12 MATHS – JEE
      CoursesClass 12MathsClass 12 MATHS – JEE
      • 1.Relations and Functions
        11
        • Lecture1.1
          Revision – Functions and its Types 38 min
        • Lecture1.2
          Revision – Functions Types 17 min
        • Lecture1.3
          Revision – Sum Related to Relations 04 min
        • Lecture1.4
          Revision – Sums Related to Relations, Domain and Range 22 min
        • Lecture1.5
          Cartesian Product of Sets, Relation, Domain, Range, Inverse of Relation, Types of Relations 34 min
        • Lecture1.6
          Functions, Intervals 39 min
        • Lecture1.7
          Domain 01 min
        • Lecture1.8
          Problem Based on finding Domain and Range 39 min
        • Lecture1.9
          Types of Real function 31 min
        • Lecture1.10
          Odd & Even Function, Composition of Function 32 min
        • Lecture1.11
          Chapter Notes – Relations and Functions
      • 2.Inverse Trigonometric Functions
        16
        • Lecture2.1
          Revision – Introduction, Some Identities and Some Sums 16 min
        • Lecture2.2
          Revision – Some Sums Related to Trigonometry Identities, trigonometry Functions Table and Its Quadrants 35 min
        • Lecture2.3
          Revision – Trigonometrical Identities-Some important relations and Its related Sums 16 min
        • Lecture2.4
          Revision – Sums Related to Trigonometrical Identities 18 min
        • Lecture2.5
          Revision – Some Trigonometric Identities and its related Sums 42 min
        • Lecture2.6
          Revision – Trigonometry Equations 44 min
        • Lecture2.7
          Revision – Sum Based on Trigonometry Equations 08 min
        • Lecture2.8
          Introduction to Inverse Trigonometry Function, Range, Domain, Question based on Principal Value 37 min
        • Lecture2.9
          Property -1 of Inverse trigo function 28 min
        • Lecture2.10
          Property -2 to 4 of Inverse trigo function 48 min
        • Lecture2.11
          Questions based on properties of Inverse trigo function 19 min
        • Lecture2.12
          Question based on useful substitution 27 min
        • Lecture2.13
          Numerical problems 19 min
        • Lecture2.14
          Numerical problems 24 min
        • Lecture2.15
          Numerical problems , introduction to Differentiation 44 min
        • Lecture2.16
          Chapter Notes – Inverse Trigonometric Functions
      • 3.Matrices
        9
        • Lecture3.1
          What is matrix 26 min
        • Lecture3.2
          Types of matrix 28 min
        • Lecture3.3
          Operations of matrices 28 min
        • Lecture3.4
          Multiplication of matrices 29 min
        • Lecture3.5
          Properties of a matrices 44 min
        • Lecture3.6
          Numerical problems 19 min
        • Lecture3.7
          Solution of simultaneous linear equation 28 min
        • Lecture3.8
          Solution of simultaneous / Homogenous linear equation 24 min
        • Lecture3.9
          Chapter Notes – Matrices
      • 4.Determinants
        6
        • Lecture4.1
          Introduction of Determinants 23 min
        • Lecture4.2
          Properties of Determinants 29 min
        • Lecture4.3
          Numerical problems 15 min
        • Lecture4.4
          Numerical problems 16 min
        • Lecture4.5
          Applications of Determinants 17 min
        • Lecture4.6
          Chapter Notes – Determinants
      • 5.Continuity
        7
        • Lecture5.1
          Introduction to continuity 28 min
        • Lecture5.2
          Numerical problems 17 min
        • Lecture5.3
          Numerical problems 22 min
        • Lecture5.4
          Basics of continuity 26 min
        • Lecture5.5
          Numerical problems 17 min
        • Lecture5.6
          Numerical problems 11 min
        • Lecture5.7
          Chapter Notes – Continuity and Differentiability
      • 6.Differentiation
        14
        • Lecture6.1
          Introduction to Differentiation 27 min
        • Lecture6.2
          Important formula’s 29 min
        • Lecture6.3
          Numerical problems 29 min
        • Lecture6.4
          Numerical problems 31 min
        • Lecture6.5
          Differentiation by using trigonometric substitution 21 min
        • Lecture6.6
          Differentiation of implicit function 21 min
        • Lecture6.7
          Differentiation of logarthmetic function 31 min
        • Lecture6.8
          Differentiation of log function 25 min
        • Lecture6.9
          Infinite series & parametric function 26 min
        • Lecture6.10
          Infinite series & parametric function 27 min
        • Lecture6.11
          Higher order derivatives 27 min
        • Lecture6.12
          Differentiation of function of a function 16 min
        • Lecture6.13
          Numerical problems 27 min
        • Lecture6.14
          Numerical problems 04 min
      • 7.Mean Value Theorem
        4
        • Lecture7.1
          Lagrange theorem 24 min
        • Lecture7.2
          Rolle’s theorem 20 min
        • Lecture7.3
          Lagrange theorem 24 min
        • Lecture7.4
          Rolle’s theorem 20 min
      • 8.Applications of Derivatives
        6
        • Lecture8.1
          Rate of change of Quantities 30 min
        • Lecture8.2
          Rate of change of Quantities 18 min
        • Lecture8.3
          Rate of change of Quantities 18 min
        • Lecture8.4
          Approximation 10 min
        • Lecture8.5
          Approximation 05 min
        • Lecture8.6
          Chapter Notes – Applications of Derivatives
      • 9.Increasing and Decreasing Function
        5
        • Lecture9.1
          Introduction 36 min
        • Lecture9.2
          Numerical Problem 26 min
        • Lecture9.3
          Numerical Problem 22 min
        • Lecture9.4
          Numerical Problem 22 min
        • Lecture9.5
          Numerical Problem 21 min
      • 10.Tangents and Normal
        3
        • Lecture10.1
          Introduction 34 min
        • Lecture10.2
          Numerical Problems 32 min
        • Lecture10.3
          Angle of intersection of two curves 27 min
      • 11.Maxima and Minima
        10
        • Lecture11.1
          Introduction 28 min
        • Lecture11.2
          Local maxima & Local Minima 27 min
        • Lecture11.3
          Numerical Problems 37 min
        • Lecture11.4
          Maximum & minimum value in closed interval 19 min
        • Lecture11.5
          Application of Maxima & Minima 10 min
        • Lecture11.6
          Application of Maxima & Minima 14 min
        • Lecture11.7
          Numerical Problems 17 min
        • Lecture11.8
          Numerical Problems 18 min
        • Lecture11.9
          Numerical Problems 15 min
        • Lecture11.10
          Numerical Problems 14 min
      • 12.Integrations
        19
        • Lecture12.1
          Introduction to Indefinite Integration 37 min
        • Lecture12.2
          Integration by substitution 25 min
        • Lecture12.3
          Numerical problems on Substitution 39 min
        • Lecture12.4
          Numerical problems on Substitution 04 min
        • Lecture12.5
          Integration various types of particular function (Identities) 31 min
        • Lecture12.6
          Integration by parts-1 18 min
        • Lecture12.7
          Integration by parts-2 10 min
        • Lecture12.8
          Integration by parts-2 16 min
        • Lecture12.9
          Integration by parts-2 08 min
        • Lecture12.10
          ILATE Rule 12 min
        • Lecture12.11
          Integration of some special function 07 min
        • Lecture12.12
          Integration of some special function 06 min
        • Lecture12.13
          Integration by substitution using trigonometric 14 min
        • Lecture12.14
          Evaluation of some specific Integration 12 min
        • Lecture12.15
          Evaluation of some specific Integration 29 min
        • Lecture12.16
          Integration by partial fraction 27 min
        • Lecture12.17
          Integration of some special function 11 min
        • Lecture12.18
          Numerical Problems based on partial fraction 20 min
        • Lecture12.19
          Chapter Notes – Integrals
      • 13.Definite Integrals
        11
        • Lecture13.1
          Introduction 24 min
        • Lecture13.2
          Properties of Definite Integration 19 min
        • Lecture13.3
          Numerical problem based on properties 22 min
        • Lecture13.4
          Area under the curve 16 min
        • Lecture13.5
          Area under the curve (Ellipse) 20 min
        • Lecture13.6
          Area under the curve (Parabola) 10 min
        • Lecture13.7
          Area under the curve (Parabola & Circle) 40 min
        • Lecture13.8
          Area bounded by lines 10 min
        • Lecture13.9
          Numerical problems 25 min
        • Lecture13.10
          Area under the curve (Circle ) 02 min
        • Lecture13.11
          Chapter Notes – Application of Integrals
      • 14.Differential Equations
        6
        • Lecture14.1
          Introduction to chapter 38 min
        • Lecture14.2
          Solution of D.E. – Variable separation methods 14 min
        • Lecture14.3
          Solution of D.E. – Variable separation methods 27 min
        • Lecture14.4
          Solution of D.E. – Second order 21 min
        • Lecture14.5
          Homogeneous D.E. 31 min
        • Lecture14.6
          Chapter Notes – Differential Equations
      • 15.Vectors
        12
        • Lecture15.1
          Introduction , Basic concepts , types of vector 34 min
        • Lecture15.2
          Position vector, distance between two points, section formula 44 min
        • Lecture15.3
          Numerical problem 02 min
        • Lecture15.4
          collinearity of points and coplanarity of vector 34 min
        • Lecture15.5
          Direction cosine 18 min
        • Lecture15.6
          Projection , Dot product, Cauchy- Schwarz inequality 24 min
        • Lecture15.7
          Numerical problem (dot product) 20 min
        • Lecture15.8
          Vector (Cross) product , Lagrange’s Identity 15 min
        • Lecture15.9
          Numerical problem (cross product) 38 min
        • Lecture15.10
          Numerical problem (cross product) 06 min
        • Lecture15.11
          Numerical problem (cross product) 22 min
        • Lecture15.12
          Chapter Notes – Vectors
      • 16.Three Dimensional Geometry
        7
        • Lecture16.1
          Introduction to 3D, axis in 3D, plane in 3D, Distance between two points 32 min
        • Lecture16.2
          Numerical problems , section formula , centroid of a triangle 35 min
        • Lecture16.3
          projection , angle between two lines 40 min
        • Lecture16.4
          Numerical Problem based on Direction ratio & cosine 02 min
        • Lecture16.5
          locus of any point 15 min
        • Lecture16.6
          Numerical Problem based on locus 16 min
        • Lecture16.7
          Chapter Notes – Three Dimensional Geometry
      • 17.Direction Cosine
        2
        • Lecture17.1
          Introduction 34 min
        • Lecture17.2
          Angle Between two vectors 25 min
      • 18.Plane
        3
        • Lecture18.1
          Introduction to plane , general equation of a plane , normal form 31 min
        • Lecture18.2
          Angle between two planes 30 min
        • Lecture18.3
          Distance of a point from a plane 29 min
      • 19.Straight Lines
        22
        • Lecture19.1
          Revision – Introduction, Equation of Line, Slope or Gradient of a line 24 min
        • Lecture19.2
          Revision – Sums Related to Finding the Slope, Angle Between two Lines 22 min
        • Lecture19.3
          Revision – Cases for Angle B/w two Lines, Different forms of Line Equation 23 min
        • Lecture19.4
          Revision – Sums Related Finding the Equation of Line 27 min
        • Lecture19.5
          Revision – Sums based on Previous Concepts of Straight line 32 min
        • Lecture19.6
          Revision – Parametric Form of a Straight Line 16 min
        • Lecture19.7
          Revision – Sums Related to Parametric Form of a Straight Line 17 min
        • Lecture19.8
          Revision – Sums Based on Concurrent of lines, Angle b/w Two Lines 45 min
        • Lecture19.9
          Revision – Different condition for Angle b/w two lines 04 min
        • Lecture19.10
          Revision – Sums Based on Angle b/w Two Lines 36 min
        • Lecture19.11
          Revision – Equation of Straight line Passes Through a Point and Make an Angle with Another Line 09 min
        • Lecture19.12
          Revision – Sums Based on Equation of Straight line Passes Through a Point and Make an Angle with Another Line 15 min
        • Lecture19.13
          Revision – Sums Based on Equation of Straight line Passes Through a Point and Make an Angle with Another Line 17 min
        • Lecture19.14
          Revision – Finding the Distance of a point from the line 35 min
        • Lecture19.15
          Revision – Sum Based on Finding the Distance of a point from the line and B/w Two Parallel Lines 33 min
        • Lecture19.16
          Introduction to straight line , symmetric form , Angle between the lines 27 min
        • Lecture19.17
          Numerical Problem 18 min
        • Lecture19.18
          Angle between two lines 32 min
        • Lecture19.19
          Unsymmetric form of Line 26 min
        • Lecture19.20
          Numerical problem , perpendicular distance of a point from a line 22 min
        • Lecture19.21
          Numerical Problem 21 min
        • Lecture19.22
          Numerical problem , Condition for a line lie on a plane 26 min
      • 20.Straight Lines (Vector)
        4
        • Lecture20.1
          Vector and Cartesian equation of a straight line 27 min
        • Lecture20.2
          Angle between two straight line 25 min
        • Lecture20.3
          Numerical problems 37 min
        • Lecture20.4
          Shortest Distance between two lines 22 min
      • 21.Linear Programming
        5
        • Lecture21.1
          Introduction to L.P. 30 min
        • Lecture21.2
          Numerical Problems 43 min
        • Lecture21.3
          Numerical Problems 23 min
        • Lecture21.4
          Numerical Problems 17 min
        • Lecture21.5
          Chapter Notes – Linear Programming
      • 22.Probability
        23
        • Lecture22.1
          Introduction to probability 41 min
        • Lecture22.2
          Types of events 42 min
        • Lecture22.3
          Numerical problems 30 min
        • Lecture22.4
          Conditional probability 12 min
        • Lecture22.5
          Numerical problems 09 min
        • Lecture22.6
          Numerical problems (conditional Probability) 04 min
        • Lecture22.7
          Numerical problems (conditional Probability) 06 min
        • Lecture22.8
          Numerical problems (conditional Probability) 05 min
        • Lecture22.9
          Numerical problems (conditional Probability) 06 min
        • Lecture22.10
          Bayes’ Theorem 17 min
        • Lecture22.11
          Numerical problem ( conditional Probability) 04 min
        • Lecture22.12
          Numerical problem ( Baye’s Theorem) 19 min
        • Lecture22.13
          Numerical problem ( Baye’s Theorem) 18 min
        • Lecture22.14
          Numerical problem ( Baye’s Theorem) 10 min
        • Lecture22.15
          Mean and Variance of a random variable 09 min
        • Lecture22.16
          Mean and Variance of a random variable 09 min
        • Lecture22.17
          Mean and Variance of a random variable 08 min
        • Lecture22.18
          Mean and Variance of a discrete random variable 07 min
        • Lecture22.19
          Numerical problem 18 min
        • Lecture22.20
          Bernoulli’s Trials & Binomial Distribution 11 min
        • Lecture22.21
          Numerical problem 12 min
        • Lecture22.22
          Mean and Variance of Binomial Distribution 05 min
        • Lecture22.23
          Chapter Notes – Probability
      • 23.Limits
        4
        • Lecture23.1
          Introduction to limits 35 min
        • Lecture23.2
          Numerical problems 27 min
        • Lecture23.3
          Rationalization 33 min
        • Lecture23.4
          Limits in trigonometry 29 min
      • 24.Partial Fractions
        4
        • Lecture24.1
          Introduction to partial fraction 27 min
        • Lecture24.2
          Partial Fractions 02 29 min
        • Lecture24.3
          Partial Fractions 03 17 min
        • Lecture24.4
          Improper partial fraction 20 min

        Chapter Notes – Three Dimensional Geometry

        Coordinate System

        The three mutually perpendicular lines in a space which divides the space into eight parts and if these perpendicular lines are the coordinate axes, then it is said to be a coordinate system.

        Coordinate System

        Sign Convention

        Sign Convention

        Distance between Two Points

        Let P(x1, y1, z1) and Q(x2, y2, z2) be two given points. The distance between these points is given by PQ √(x2 – x1)2 + (y2 – y1)2 + (z2 – z1)2

        The distance of a point P(x, y, z) from origin O is OP = √x2 + y2 + z2

        Section Formulae

        (i) The coordinates of any point, which divides the join of points P(x1, y1, z1) and Q(x2, y2, z2) in the ratio m : n internally are (mx2 + nx1 / m + n, my2 + ny1 / m + n, mz2 + nz1 / m + n)
        (ii) The coordinates of any point, which divides the join of points P(x1, y1, z1) and Q(x2, y2, z2) in the ratio m : n externally are (mx2 – nx1 / m – n, my2 – ny1 / m – n, mz2 – nz1 / m – n)
        (iii) The coordinates of mid-point of P and Q are (x1 + x2 / 2 , y1 + y2 / 2, z1 + z2 / 2)
        (iv) Coordinates of the centroid of a triangle formed with vertices P(x1, y1, z1) and Q(x2, y2, z2) and R(x3, y3, z3) are (x1 + x2 + x3 / 3 , y1 + y2 + y3 / 3, z1 + z2 + z3 / 3)
        (v) Centroid of a Tetrahedron
        If (x1, y1, z1), (x2, y2, z2), (x3, y3, z3) and (x4, y4, z4) are the vertices of a tetrahedron, then its centroid G is given by (x1 + x2 + x3 + x4 / 4 , y1 + y2 + y3 + y4 / 4, z1 + z2 + z3 + z4 / 4)

        Direction Cosines

        If a directed line segment OP makes angle α, β and γ with OX , OY and OZ respectively, then Cos α, cos β and cos γ are called direction cosines of up and it is represented by l, m, n.
        i.e.,
        l = cos α
        m = cos β and n = cos γ

        Direction Cosines

        If OP = r, then coordinates of OP are (lr, mr , nr)

        (i) If 1, m, n are direction cosines of a vector r, then
        (a) r = |r| (li + mj + nk) ⇒ r = li + mj + nk
        (b) l2 + m2 + n2 = 1
        (c) Projections of r on the coordinate axes are
        (d) |r| = l|r|, m|r|, n|r| / √sum of the squares of projections of r on the coordinate axes

        (ii) If P(x1, y1, z1) and Q(x2, y2, z2) are two points, such that the direction cosines of PQ are l, m, n. Then, x2 – x1 = l|PQ|, y2 – y1 = m|PQ|, z2 – z1 = n|PQ| These are projections of PQ on X , Y and Z axes, respectively.
        (iii) If 1, m, n are direction cosines of a vector r and a b, c are three numbers, such that l / a = m / b = n / c.
        Then, we say that the direction ratio of r are proportional to a, b, Also, we have l = a / √a2 + b2 + c2, m = b / √a2 + b2 + c2, n = c / √a2 + b2 + c2
        (iv) If θ is the angle between two lines having direction cosines l1, m1, n1 and 12, m2, n2, then cos θ = l112 + m1m2 + n1n2
        (a) Lines are parallel, if l1 / 12 = m1 / m2 = n1 / n2
        (b) Lines are perpendicular, if l112 + m1m2 + n1n2
        (v) If θ is the angle between two lines whose direction ratios are proportional to a1, b1, c1 and a2, b2, c2 respectively, then the angle θ between them is given by cos θ = a1a2 + b1b2 + c1c2 / √a2 1 + b2 1 + c2 1 √a2 2 + b2 2 + c2 2
        Lines are parallel, if a1 / a2 = b1 / b2 = c1 / c2
        Lines are perpendicular, if a1a2 + b1b2 + c1c2 = 0.
        (vi) The projection of the line segment joining points P(x1, y1, z1) and Q(x2, y2, z2) to the line having direction cosines 1, m, n is |(x2 – x1)l + (y2 – y1)m + (z2 – z1)n|.
        (vii) The direction ratio of the line passing through points P(x1, y1, z1) and Q(x2, y2, z2) are proportional to x2 – x1, y2 – y1 – z2 – z1
        Then, direction cosines of PQ arex2 – x1 / |PQ|, y2 – y1 / |PQ|, z2 – z1 / |PQ|

        Area of Triangle

        If the vertices of a triangle be A(x1, y1, z1) and B(x2, y2, z2) and C(x3, y3, z3), then

        Area of Triangle

        Angle Between Two Intersecting Lines

        If l(x1, m1, n1) and l(x2, m2, n2) be the direction cosines of two given lines, then the angle θ between them is given by cos θ = l112 + m1m2 + n1n2

        (i) The angle between any two diagonals of a cube is cos-1 (1 / 3).
        (ii) The angle between a diagonal of a cube and the diagonal of a face (of the cube is cos-1 (√2 / 3)

        Straight Line in Space

        The two equations of the line ax + by + cz + d = 0 and a’ x + b’ y + c’ z + d’ = 0 together represents a straight line.

        1. Equation of a straight line passing through a fixed point A(x1, y1, z1) and having direction ratios a, b, c is given by x – x1 / a = y – y1 / b = z – z1 / c, it is also called the symmetrically form of a line.
        Any point P on this line may be taken as (x1 + λa, y1 + λb, z1 + λc), where λ ∈ R is parameter. If a, b, c are replaced by direction cosines 1, m, n, then λ, represents
        distance of the point P from the fixed point A.

         

        2. Equation of a straight line joining two fixed points A(x1, y1, z1) and B(x2, y2, z2) is given by x – x1 / x2 – x1 = y – y1 / y2 – y1 = z – z1 / z2 – z1

        3. Vector equation of a line passing through a point with position vector a and parallel to vector b is r = a + λ b, where A, is a parameter.

        4. Vector equation of a line passing through two given points having position vectors a and b is r = a + λ (b – a) , where λ is a parameter.

        5. (a) The length of the perpendicular from a point Straight Line in Spaceon the line r – a + λ b is given by

        Straight Line in Space

        (b) The length of the perpendicular from a point P(x1, y1, z1) on the line

        Straight Line in Space

        where, 1, m, n are direction cosines of the line.

        6. Skew Lines Two straight lines in space are said to be skew lines, if they are neither parallel
        nor intersecting.

        7. Shortest Distance If l1 and l2 are two skew lines, then a line perpendicular to each of lines 4 and 12 is known as the line of shortest distance.

        If the line of shortest distance intersects the lines l1 and l2 at P and Q respectively, then the distance PQ between points P and Q is known as the shortest distance between l1 and l2.

        8. The shortest distance between the lines

        Straight Line in Space

        9. The shortest distance between lines r = a1 + λb1 and r = a2 + μb2 is given by

        Straight Line in Space

        10. The shortest distance parallel lines r = a1 + λb1 and r = a2 + μb2 is given by

        Straight Line in Space

        11. Lines r = a1 + λb1 and r = a2 + μb2 are intersecting lines, if (b1 * b2) * (a2 – a1) = 0.

        12. The image or reflection (x, y, z) of a point (x1, y1, z1) in a plane ax + by + cz + d = 0 is given by x – x1 / a = y – y1 / b = z – z1 / c = – 2 (ax1 + by1 + cz1 + d) / a2 + b2 + c2

        13. The foot (x, y, z) of a point (x1, y1, z1) in a plane ax + by + cz + d = 0 is given by x – x1 / a = y – y1 / b = z – z1 / c = – (ax1 + by1 + cz1 + d) / a2 + b2 + c2

        14. Since, x, y and z-axes pass through the origin and have direction cosines (1, 0, 0), (0, 1, 0) and (0, 0, 1), respectively. Therefore, their equations are
        x – axis : x – 0 / 1 = y – 0 / 0 = z – 0 / 0
        y – axis : x – 0 / 0 = y – 0 / 1 = z – 0 / 0z – axis : x – 0 / 0 = y – 0 / 0 = z – 0 / 1

         

        Plane

        A plane is a surface such that, if two points are taken on it, a straight line joining them lies wholly in the surface.

        General Equation of the Plane

        The general equation of the first degree in x, y, z always represents a plane. Hence, the general equation of the plane is ax + by + cz + d = 0. The coefficient of x, y and z in the cartesian equation of a plane are the direction ratios of normal to the plane.

        Equation of the Plane Passing Through a Fixed Point

        The equation of a plane passing through a given point (x1, y1, z1) is given by a(x – x1) + b (y — y1) + c (z — z1) = 0.

        Normal Form of the Equation of Plane

        (i) The equation of a plane, which is at a distance p from origin and the direction cosines of the normal from the origin to the plane are l, m, n is given by lx + my + nz = p.
        (ii) The coordinates of foot of perpendicular N from the origin on the plane are (1p, mp, np).

        Normal Form of the Equation of Plane

        Intercept Form

        The intercept form of equation of plane represented in the form of x / a + y / b + z / c = 1
        where, a, b and c are intercepts on X, Y and Z-axes, respectively.
        For x intercept Put y = 0, z = 0 in the equation of the plane and obtain the value of x. Similarly, we can determine for other intercepts.

        Equation of Planes with Given Conditions

        (i) Equation of a plane passing through the point A(x1, y1, z1) and parallel to two given lines with direction ratios

        Equation of Planes with Given Conditions

        (ii) Equation of a plane through two points A(x1, y1, z1) and B(x2, y2, z2) and parallel to a line with direction ratios a, b, c is

        Equation of Planes with Given Conditions

        (iii) The Equation of a plane passing through three points A(x1, y1, z1), B(x2, y2, z2) and C(x3, y3, z3) is

        Equation of Planes with Given Conditions

        (iv) Four points A(x1, y1, z1), B(x2, y2, z2), C(x3, y3, z3) and D(x4, y4, z4) are coplanar if and only if

        Equation of Planes with Given Conditions

        (v) Equation of the plane containing two coplanar lines

        Equation of Planes with Given Conditions

        Angle between Two Planes

        The angle between two planes is defined as the angle between the normal to them from any point.
        Thus, the angle between the two planes a1x + b1y + c1z + d1 = 0 and a2x + b2y + c2z + d2 = 0

        Angle between Two Planes

        is equal to the angle between the normals with direction cosines ± a1 / √Σ a2 1, ± b1 / √Σ a2 1, ± c1 / √Σ a2 1 and ± a2 / √Σ a2 2, ± b2 / √Σ a2 2, ± c2 / √Σ a2 2

        If θ is the angle between the normals, then cos θ = ± a1a2 + b1b2 + c1c2 / √a21 + b2 1 + c2 1 √a2 2 + b2 2 + c2 2

         

        Parallelism and Perpendicularity of Two Planes

        Two planes are parallel or perpendicular according as the normals to them are parallel or perpendicular.
        Hence, the planes a1x + b1y + c1z + d1 = 0 and a2x + b2y + c2z + d2 = 0 are parallel, if a1 / a2 = b1 / b2 = c1 / c2 and perpendicular, if a1a2 + b1b2 + c1c2 = 0.
        Note The equation of plane parallel to a given plane ax + by + cz + d = 0 is given by ax + by + cz + k = 0, where k may be determined from given conditions.

        Angle between a Line and a Plane

        In Vector Form The angle between a line r = a + λ b and plane r *• n = d, is defined as the complement of the angle between the line and normal to the plane:

        sin θ = n * b / |n||b|

        In Cartesian Form The angle between a line x – x1 / a1 = y – y1 / b1 = z – z1 / c1 and plane a2x + b2y + c2z + d2 = 0 is sin θ = a1a2 + b1b2 + c1c / √a2 1 + b2 1 + c2 1 √a22 + b2 2 + c2 2

        Distance of a Point from a Plane

        Let the plane in the general form be ax + by + cz + d = 0. The distance of the point P(x1, y1, z1) from the plane is equal to

        Distance of a Point from a Plane

        Distance of a Point from a Plane

        If the plane is given in, normal form lx + my + nz = p. Then, the distance of the point P(x1, y1, z1) from the plane is |lx1 + my1 + nz1 – p|.

        Distance between Two Parallel Planes

        If ax + by + cz + d1 = 0 and ax + by + cz + d2 = 0 be equation of two parallel planes. Then, the distance between them is

        Distance between Two Parallel Planes

        Bisectors of Angles between Two Planes

        The bisector planes of the angles between the planes a1x + b1y + c1z + d1 = 0, a2x + b2y + c2z + d2 = 0 is a1x + b1y + c1z + d1 / √Σa2 1 = ± a2x + b2y + c2z + d2 / √Σa2 2

        One of these planes will bisect the acute angle and the other obtuse angle between the given plane.

        Sphere

        A sphere is the locus of a point which moves in a space in such a way that its distance from a fixed point always remains constant.

        General Equation of the Sphere
        In Cartesian Form

        The equation of the sphere with centre (a, b, c) and radius r is (x – a)2 + (y – b)2 + (z – c)2 = r2 …….(i)
        In generally, we can write x2 + y2 + z2 + 2ux + 2vy + 2wz + d = 0
        Here, its centre is (-u, v, w) and radius = √u2 + v2 + w2 – d

        In Vector Form

        The vector equation of a sphere of radius a and Centre having position vector c is |r – c| = a

        Important Points to be Remembered

        (i) The general equation of second degree in x, y, z is ax2 + by2 + cz2 + 2hxy + 2kyz + 2lzx + 2ux + 2vy + 2wz + d = 0 represents a sphere, if
        (a) a = b = c (≠ 0)
        (b) h = k = 1 = 0
        The equation becomes ax2 + ay2 + az2 + 2ux + 2vy + 2wz + d – 0 …(A)

        To find its centre and radius first we make the coefficients of x2, y2 and z2 each unity by dividing throughout by a.
        Thus, we have x2+y2+z2 + (2u / a) x + (2v / a) y + (2w / a) z + d / a = 0 …..(B)
        ∴ Centre is (- u / a, – v / a, – w / a)
        and radius = √u2 / a2 + v2 / a2 + w2 / a2 – d / a
        = √u2 + v2 + w2 – ad / |a| .

        (ii) Any sphere concentric with the sphere x2 + y2 + z2 + 2ux + 2vy + 2wz + d = 0 is x2 + y2 + z2 + 2ux + 2vy + 2wz + k = 0
        (iii) Since, r2 = u2 + v2 + w2 — d, therefore, the Eq. (B) represents a real sphere, if u2 +v2 + w2 — d > 0
        (iv) The equation of a sphere on the line joining two points (x1, y1, z1) and (x2, y2, z2) as a diameter is
        (x – x1) (x – x1) + (y – y1) (y – y2) + (z – z1) (z – z2) = 0.
        (v) The equation of a sphere passing through four non-coplanar points (x1, y1, z1), (x2, y2, z2),
        (x3, y3, z3) and (x4, y4, z4) is

        Important Points to be Remembered

        Tangency of a Plane to a Sphere

        The plane lx + my + nz = p will touch the sphere x2 + y2 + z2 + 2ux + 2vy + 2 wz + d = 0, if length of the perpendicular from the centre ( – u, – v,— w)= radius, i.e., |lu – mv – nw – p| / √l2 + m2 + n2
        = √u2 + v2 + w2 – d (lu – mv – nw – p)2 = (u2 + v2 + w2 – d) (l2 + m2 + n2)

        Plane Section of a Sphere

        Consider a sphere intersected by a plane. The set of points common to both sphere and plane is called a plane section of a sphere. In ΔCNP, NP2 = CP2 – CN2 = r2 – p2
        ∴ NP = √r2 – p2

        Plane Section of a Sphere

        Hence, the locus of P is a circle whose centre is at the point N, the foot of the perpendicular from the centre of the sphere to the plane.
        The section of sphere by a plane through its centre is called a great circle. The centre and radius of a great circle are the same as those of the sphere.

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