1
AP EAPCET 2025 - 27th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

If the function $f$ defined by

$$ f(x)=\left\{\begin{array}{cc} \frac{1-\cos 4 x}{x^2}, & x<0 \\ a, & x=0 \\ \frac{\sqrt{x}}{\sqrt{16+\sqrt{x}}-4}, & x>0 \end{array}\right. $$

is continuous at $x=0$, then $a=$

A

1

B

2

C

4

D

8

2
AP EAPCET 2025 - 27th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

The domain of the derivative of the function $f(x)=\frac{x}{1+|x|}$ is

A

$[0, \infty)$

B

$(-\infty, 0)$

C

$(-\infty, \infty)$

D

$(0, \infty)$

3
AP EAPCET 2025 - 27th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

If $x=\sqrt{2^{\operatorname{cosec}^{-1} t}}$ and $y=\sqrt{2^{\sec ^{-1} t}},|t| \geq 1$, then $\frac{d y}{d x}=$

A

$\frac{x}{y}$

B

$\frac{y}{x}$

C

$-\frac{y}{x}$

D

$-\frac{x}{y}$

4
AP EAPCET 2025 - 27th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

If $(a+\sqrt{2} b \cos x)(a-\sqrt{2} b \cos y) =a^2-b^2$, where $a>b>0$, then at $\left(\frac{\pi}{4}, \frac{\pi}{4}\right), \frac{d y}{d x}=$

A

$\frac{a+b}{a-b}$

B

$\frac{a-b}{a+b}$

C

$\frac{a-2 b}{a+2 b}$

D

$\frac{2 a+b}{2 a-b}$