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JEE MATHEMATICS MCQ: DIFFERENTIATION

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Application +4 | -1

If

x=2 \cos t-\cos 2 t, y=2 \sin t-\sin 2 t

, then

d y / d x

at

t=\pi / 6

is

View answer and explanation

Correct option: D

1

Option D (1) is correct because, after finding

\frac{dx}{dt}

and

\frac{dy}{dt}

, we compute

\frac{dy}{dx} = \frac{dy/dt}{dx/dt} = tan(\frac{3t}{2})

. Evaluating at

t = \frac{\pi}{6}

gives

\frac{dy}{dx} = tan(\frac{\pi}{4}) = 1

.

More Questions from DIFFERENTIATION

Practice All Chapter MCQs →

f(x)=|x|^{|\tan x|}

f^{\prime}\left(\frac{-\pi}{6}\right)

is equal to Let

x

y

be two real numbers such that

x>0

x y=1

. The minimum value of

x+y

f(x)=[x] \sin (\pi x)

[x]

denotes the integer part of

x

x=k, k

being an integer, the left derivative of

f(x)

y = {\sec ^{ - 1}}\left[ {\mathrm{cosec}x} \right] + \mathrm{cose}{\mathrm{c}^{ - 1}}\left[ {\sec x} \right] + {\sin ^{ - 1}}[\cos x] + {\cos ^{ - 1}}[\sin x],

\frac{{dy}}{{dx}}

\frac{d}{d x} \sin ^{-1}\left(3 x-4 x^{3}\right)

z = y + f\left( v \right),

v = \left( {\frac{x}{y}} \right),

v\frac{{\partial z}}{{\partial x}} + \frac{{\partial z}}{{\partial y}}