Mathbee · CBSE Class 12 Maths

CBSE Board Paper 2026 80 Marks · 38 Questions

CBSE Class 12 Mathematics 2026 Main Paper 65/2/1 — Step-by-Step Solutions & Marking Scheme

Select any question below to view the complete worked solution and official CBSE stepwise marking breakdown.

Question 11M · Relations And Functions

On A={1,2,3}, classify R={(1,1),(2,2),(1,2)}.

Question 21M · Matrices

For same-order square matrices A and B, which statements always hold? (i) (A+B)(A−B)=A²−B². (ii) AB=BA. (iii)…

Question 31M · Matrices

If [[1,a,b],[−1,2,c],[0,5,3]] is symmetric, find 3a+b+c.

Question 41M · Matrices

For A=[[cos x,−sin x],[sin x,cos x]], solve A+Aᵀ=I for x in [0,π/2].

Question 51M · Matrices

For a square matrix A, which expression equals (3A)⁻¹ when it exists?

Question 61M · Determinants

The determinant of [[−1,−2,5],[−2,a,−1],[0,4,2a]] is −86. Find the sum of the possible a values.

Question 71M · Continuity And Differentiability

If e⁻ˣ+e⁻ʸ=2, find dy/dx.

Question 81M · Applications Of Derivatives

Which statement holds for f(x)=x+1/x, x≠0?

Question 91M · Integrals

If \(\int_0^{2a}\frac{dx}{1+4x^2}=\frac{\pi}{6}\), find a.

Question 101M · Applications Of Integrals

Which expression gives the area bounded by y=x² and y=16?

Question 111M · Differential Equations

Choose the general nonzero solution family for \(\frac{dy}{dx}=\frac{\sqrt y}{\sqrt x}\).

Question 121M · Differential Equations

Find the listed integrating factor for 2x y′−y=3.

Question 131M · Vector Algebra

If |a|=5 and −2≤λ≤1, find the sum of the largest and smallest values of |λa|.

Question 141M · Vector Algebra

Which vector of magnitude 3 makes equal angles with the x- and y-axes and is perpendicular to the z-axis?

Question 151M · Three Dimensional Geometry

Find the direction cosines of (2x−1)/4=(1−y)/3=−z/6 in the orientation given by increasing common parameter.

Question 161M · Linear Programming

What is the linear function that a linear programming problem maximizes or minimizes?

Question 171M · Linear Programming

Which pair gives the nontrivial constraints for the shaded feasible region?

Question 181M · Probability

For events A and B with P(A)≠0 and P(B)≠1, find P(A′ | B′).

Question 191M · Vector Algebra

Assertion: |a×b|²+(a·b)²=|a|²|b|². Reason: |a×b|=(a·b) tan θ for θ≠π/2, where θ is the angle between the vectors.

Question 201M · Three Dimensional Geometry

Assertion: A line can have direction cosines (1,1,1). Reason: cos θ=1 is possible for θ=0.

Question 212M · Relations And Functions

Is f: ℝ∖{3}→ℝ, f(x)=(x−2)/(x−3), onto? OR Is f: ℤ×ℤ→ℤ×ℤ, f(x,y)=(2y,3x), injective?

Question 222M · Continuity And Differentiability

If x=a sin³t and y=b cos³t, find dy/dx at t=π/4.

Question 232M · Applications Of Derivatives

Find the absolute maximum of cos x+sin²x on [0,π]. OR The volume of a solid hemisphere increases at a uniform rate…

Question 242M · Vector Algebra

For AB=(0,1,1) and AC=(3,−1,4), prove AD=(AB+AC)/2 where D is the midpoint of BC, then find |AD|.

Question 252M · Three Dimensional Geometry

Find the point on r=(0,−1,3)+λ(2,−2,1) whose coordinate sum is 3.

Question 263M · Integrals

Find \(\int\frac{x+2}{\sqrt{9x-x^2}}\,dx\).

Question 273M · Integrals

Evaluate \(\int_{\pi/12}^{5\pi/12}\frac{dx}{1+\sqrt{\cot x}}\). OR Evaluate…

Question 283M · Integrals

Find F if F′(x)=1/(eˣ+1) and F(0)=ln(1/2).

Question 293M · Differential Equations

Solve \(xy\prime=y-x\sin^2(y/x)\), given \(y(1)=\pi/6\). OR Solve \(y\ln y\,\frac{dx}{dy}+x=\frac2y\).

Question 303M · Linear Programming

Graphically maximize Z=10500x+9000y for x+y≤50, 2x+y≤80 and x,y≥0.

Question 313M · Probability

On a stormy day a sniper is three times as likely to hit as to miss with each shot. For two shots, find the…

Question 325M · Matrices

For P=[[1,−1,0],[2,3,4],[0,1,2]] and Q=[[2,2,−4],[−4,2,−4],[2,−1,5]], compute QP. Use matrices to solve x−y=3…

Question 335M · Applications Of Derivatives

For f(x)=arccot(sin x+cos x), x∈(0,π), find its increasing and decreasing intervals. OR A rectangle of perimeter 36 cm…

Question 345M · Inverse Trigonometric Functions

Find the domain of g(x)=arccos(x²−1), solve g(x)=π/3, and give the range of a nonprincipal inverse cosine branch.

Question 355M · Three Dimensional Geometry

Find the intersection of the line through A=(1,2,3), B=(5,8,11) and r=(4,1,0)+t(5,2,1). Find the line through the…

Question 364M · Probability

In a group of 50 smokers, 30 are male. Lung complications occur in 170 per 1000 male smokers and 120 per 1000 female…

Question 374M · Applications Of Integrals

A 3 m wide track surrounds an elliptical ground given by 9x²+16y²=144. The outer edge meets the positive x- and y-axes…

Question 384M · Continuity And Differentiability

A racing track has equation y=f(x), where f(x)=x⁴−4x²+4 for 0≤x<3 and f(x)=x²+40 for x≥3.