1
KCET 2025
MCQ (Single Correct Answer)
+1
-0

The function $f(x)=\left\{\begin{array}{ll}e^x+a x & , x<0 \\ b(x-1)^2 & , x \geq 0\end{array}\right.$ is differentiable at $x=0$. Then

A
$a=1, b=1$
B
$a=3, b=1$
C
$a=-3, b=1$
D
$a=3, b=-1$
2
KCET 2025
MCQ (Single Correct Answer)
+1
-0

$$ \text { A function } f(x)=\left\{\begin{array}{cl} \frac{e^{\frac{1}{x}}-1}{e^{\frac{1}{x}}+1}, & \text { if } x \neq 0 \\ 0, & \text { if } x=0 \end{array}\right. $$

A
continuous at $\mathrm{x}=0$
B
not continuous at $x=0$
C
differentiable at $x=0$
D
differentiable at $\mathrm{x}=0$, but not continuous at $\mathrm{x}=0$
3
KCET 2025
MCQ (Single Correct Answer)
+1
-0

If $\mathrm{y}=\mathrm{a} \sin ^3 \mathrm{t}, \mathrm{x}=\mathrm{a} \cos ^3 \mathrm{t}$, then $\frac{\mathrm{dy}}{\mathrm{dx}}$ at $\mathrm{t}=\frac{3 \pi}{4}$ is

A
-1
B
$\frac{1}{\sqrt{3}}$
C
$-\sqrt{3}$
D
1
4
KCET 2025
MCQ (Single Correct Answer)
+1
-0

The derivative of $\sin \mathrm{x}$ with respect to $\log \mathrm{x}$ is

A
$\cos x$
B
$x \cos x$
C
$\frac{\cos x}{\log x}$
D
$\frac{\cos x}{x}$
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