# Question Bank Solutions for CBSE (Arts) Class 12 - CBSE - Mathematics

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If |[2x,5],[8,x]|=|[6,-2],[7,3]|, write the value of x.

[2.01] Determinants
Chapter: [2.01] Determinants
Concept: Applications of Determinants and Matrices

Show that the lines (x+1)/3=(y+3)/5=(z+5)/7 and (x−2)/1=(y−4)/3=(z−6)/5 intersect. Also find their point of intersection

[4.01] Three - Dimensional Geometry
Chapter: [4.01] Three - Dimensional Geometry
Concept: Three - Dimensional Geometry Examples and Solutions

Find the distance of the point (−1, −5, −10) from the point of intersection of the line vecr=2hati-hatj+2hatk+lambda(3hati+4hatj+2hatk)  and the plane vec r (hati-hatj+hatk)=5

[4.01] Three - Dimensional Geometry
Chapter: [4.01] Three - Dimensional Geometry
Concept: Three - Dimensional Geometry Examples and Solutions

Write the value of tan(2tan^(-1)(1/5))

[1.01] Inverse Trigonometric Functions
Chapter: [1.01] Inverse Trigonometric Functions
Concept: Inverse Trigonometric Functions (Simplification and Examples)

Find the value of a if [[a-b,2a+c],[2a-b,3c+d]]=[[-1,5],[0,13]]

[2.01] Determinants
Chapter: [2.01] Determinants
Concept: Applications of Determinants and Matrices

If |[x+1,x-1],[x-3,x+2]|=|[4,-1],[1,3]|, then write the value of x.

[2.01] Determinants
Chapter: [2.01] Determinants
Concept: Applications of Determinants and Matrices

Find the value of the following: tan(1/2)[sin^(-1)((2x)/(1+x^2))+cos^(-1)((1-y^2)/(1+y^2))],|x| <1,y>0 and xy <1

[1.01] Inverse Trigonometric Functions
Chapter: [1.01] Inverse Trigonometric Functions
Concept: Inverse Trigonometric Functions (Simplification and Examples)

Using integration, find the area bounded by the curve x2 = 4y and the line x = 4y − 2.

[3.03] Applications of the Integrals
Chapter: [3.03] Applications of the Integrals
Concept: Area of the Region Bounded by a Curve and a Line

Differentiate xsinx+(sinx)cosx with respect to x.

[3.01] Continuity and Differentiability
Chapter: [3.01] Continuity and Differentiability
Concept: Derivative - Exponential and Log

Solve the equation for x:sin1x+sin1(1x)=cos1x

[1.01] Inverse Trigonometric Functions
Chapter: [1.01] Inverse Trigonometric Functions
Concept: Inverse Trigonometric Functions (Simplification and Examples)

If cos^-1( x/a) +cos^-1 (y/b)=alpha , prove that x^2/a^2-2(xy)/(ab) cos alpha +y^2/b^2=sin^2alpha

[1.01] Inverse Trigonometric Functions
Chapter: [1.01] Inverse Trigonometric Functions
Concept: Inverse Trigonometric Functions (Simplification and Examples)

Prove that the curves y2 = 4x and x2 = 4y divide the area of square bounded by x = 0, x = 4, y = 4 and y = 0 into three equal parts.

[3.03] Applications of the Integrals
Chapter: [3.03] Applications of the Integrals
Concept: Area of the Region Bounded by a Curve and a Line

If A=[[2,0,1],[2,1,3],[1,-1,0]] , find A2 − 5 A + 16 I.

[2.02] Matrices
Chapter: [2.02] Matrices
Concept: Introduction of Operations on Matrices

Prove that :

2 tan^-1 (sqrt((a-b)/(a+b))tan(x/2))=cos^-1 ((a cos x+b)/(a+b cosx))

[1.01] Inverse Trigonometric Functions
Chapter: [1.01] Inverse Trigonometric Functions
Concept: Inverse Trigonometric Functions (Simplification and Examples)

Solve the following for x :

tan^(-1)((x-2)/(x-3))+tan^(-1)((x+2)/(x+3))=pi/4,|x|<1

[1.01] Inverse Trigonometric Functions
Chapter: [1.01] Inverse Trigonometric Functions
Concept: Inverse Trigonometric Functions (Simplification and Examples)

Using integration, find the area of the region bounded by the lines y = 2 + x, y = 2 – x and x = 2.

[3.03] Applications of the Integrals
Chapter: [3.03] Applications of the Integrals
Concept: Area of the Region Bounded by a Curve and a Line

Find the direction ratios of the normal to the plane, which passes through the points (1, 0, 0) and (0, 1, 0) and makes angle π/4 with the plane x + y = 3. Also find the equation of the plane

[4.01] Three - Dimensional Geometry
Chapter: [4.01] Three - Dimensional Geometry
Concept: Three - Dimensional Geometry Examples and Solutions

Find the the differential equation for all the straight lines, which are at a unit distance from the origin.

[3.04] Differential Equations
Chapter: [3.04] Differential Equations
Concept: Methods of Solving First Order, First Degree Differential Equations > Linear Differential Equations

Find the coordinates of the foot of perpendicular drawn from the point A (-1,8,4) to the line joining the points B(0,-1,3) and C(2,-3,-1). Hence find the image of the point A in the line BC.

[4.01] Three - Dimensional Geometry
Chapter: [4.01] Three - Dimensional Geometry
Concept: Three - Dimensional Geometry Examples and Solutions

Write the element a12 of the matrix A = [aij]2 × 2, whose elements aij are given by aij = e2ix sin jx.

[2.02] Matrices
Chapter: [2.02] Matrices
Concept: Introduction of Operations on Matrices
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