JEE MATHEMATICS MCQ: DIFFERENTIATION

1 Hard

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Analyzing +4 | -1

Let

f(x) = 15 - \left| {x - 10} \right|;\,\,x \in R

. Then, the set of all values of

x

, at which the function,

g(x) = f(f(x))

is not differentiable, is

View answer and explanation

Correct option: B

\left\{ {5,\,10,\,15} \right\}

Option B ({5, 10, 15}) is correct because these are the points where the absolute value function inside g(x) changes its behavior, leading to non-differentiability.

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

, then

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

is equal to Let

x

and

y

be two real numbers such that

x>0

and

x y=1

. The minimum value of

x+y

is Let

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

where

[x]

denotes the integer part of

x

. Then at

x=k, k

being an integer, the left derivative of

f(x)

is If

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],

then

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

is equal to

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

is equal to If

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

where

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

then

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