Commerce (English Medium) Class 12 - CBSE Question Bank Solutions for Mathematics

If x = a cos nt − b sin nt, then \[\frac{d^2 x}{d t^2}\] is 

If x = at², y = 2 at, then \[\frac{d^2 y}{d x^2} =\] 

If y = axⁿ⁺¹ + bx⁻ⁿ, then \[x^2 \frac{d^2 y}{d x^2} =\] 

\[\frac{d^{20}}{d x^{20}} \left( 2 \cos x \cos 3 x \right) =\]

If x = t², y = t³, then \[\frac{d^2 y}{d x^2} =\] 

If y = a + bx², a, b arbitrary constants, then

If f(x) = (cos x + i sin x) (cos 2x + i sin 2x) (cos 3x + i sin 3x) ...... (cos nx + i sin nx) and f(1) = 1, then f'' (1) is equal to

If y = a sin mx + b cos mx, then \[\frac{d^2 y}{d x^2}\]   is equal to

If \[f\left( x \right) = \frac{\sin^{- 1} x}{\sqrt{1 - x^2}}\] then (1 − x)² f '' (x) − xf(x) =

If \[y = \tan^{- 1} \left\{ \frac{\log_e \left( e/ x^2 \right)}{\log_e \left( e x^2 \right)} \right\} + \tan^{- 1} \left( \frac{3 + 2 \log_e x}{1 - 6 \log_e x} \right)\], then \[\frac{d^2 y}{d x^2} =\]

Let f(x) be a polynomial. Then, the second order derivative of f(e^x) is

If y = a cos (log_e x) + b sin (log_e x), then x² y₂ + xy₁ =

If x = 2 at, y = at², where a is a constant, then \[\frac{d^2 y}{d x^2} \text { at x } = \frac{1}{2}\] is 

If x = f(t) and y = g(t), then \[\frac{d^2 y}{d x^2}\] is equal to

If y = sin (m sin⁻¹ x), then (1 − x²) y₂ − xy₁ is equal to

If y = (sin⁻¹ x)², then (1 − x²)y₂ is equal to

If y = e^tan x, then (cos² x)y₂ =

If \[y = \frac{ax + b}{x^2 + c}\] then (2xy₁ + y)y₃ = 

If \[y = \log_e \left( \frac{x}{a + bx} \right)^x\] then x³ y₂ =

If x = f(t) cos t − f' (t) sin t and y = f(t) sin t + f'(t) cos t, then\[\left( \frac{dx}{dt} \right)^2 + \left( \frac{dy}{dt} \right)^2 =\]