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94
MCQ (Single Correct Answer)

If $x=t^2$ and $y=t^3$, then $\frac{d^2 y}{d x^2}$ is equal to

A
$\frac{3}{2}$
B
$\frac{3}{4 t}$
C
$\frac{3}{2 t}$
D
$\frac{3}{2 t}$
95
MCQ (Single Correct Answer)

The value of $c$ in Rolle's theorem for the function $f(x)=x^3-3 x$ in the interval $[0, \sqrt{3}]$ is

A
$1$
B
$-1$
C
$\frac{3}{2}$
D
$\frac{1}{3}$
96
MCQ (Single Correct Answer)

For the function $f(x)=x+\frac{1}{x}, x \in[1,3]$, the value of $c$ for mean value theorem is

A
1
B
$\sqrt3$
C
2
D
None of these
97

An example of a function which is continuous everywhere but fails to be differentiable exactly at two points is ............. .

Explanation

$|x|+|x-1|$ is continuous everywhere but fails to be differentiable exactly at two points $x=0$ and $x=1$.

So, there can be more such examples of functions.

98

Derivative of $x^2$ w.r.t. $x^3$ is ............. .

Explanation

Derivative of $x^2$ w.r.t. $x^3$ is $\frac{2}{3 x}$.

Let $$u=x^2 \text { and } v=x^3$$

$$\begin{array}{ll} \therefore & \frac{d u}{d x}=2 x \text { and } \frac{d v}{d x}=3 x^2 \\ \Rightarrow & \frac{d u}{d v}=\frac{2 x}{3 x^2}=\frac{2}{3 x} \end{array}$$