1
AP EAPCET 2025 - 21st May Evening Shift
MCQ (Single Correct Answer)
+1
-0

If a function $f$ defined by

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

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

A

8

B

4

C

3

D

2

2
AP EAPCET 2025 - 21st May Evening Shift
MCQ (Single Correct Answer)
+1
-0

If $y=\tanh ^{-1} \sqrt{\frac{1-x}{1+x}}$, then $\frac{d y}{d x}=$

A

$-\frac{1}{2 \sqrt{1-x^2}}$

B

$\frac{-1}{2 x \sqrt{1-x^2}}$

C

$\frac{2}{1+x^2}$

D

$\frac{1}{2 x \sqrt{1+x^2}}$

3
AP EAPCET 2025 - 21st May Evening Shift
MCQ (Single Correct Answer)
+1
-0

If $x^2+y^2=t-\frac{1}{t}$ and $x^4+y^4=t^2+\frac{1}{t^2}$, then $\frac{d y}{d x}=$

A

$\frac{y}{x}$

B

$\frac{y^2}{x^2}$

C

$\sqrt{\frac{y}{x}}$

D

$-\frac{y}{x}$

4
AP EAPCET 2025 - 21st May Evening Shift
MCQ (Single Correct Answer)
+1
-0

If $y=(a x+b) \cos x$, then

$$ y_2+y_1 \sin 2 x+y\left(1+\sin ^2 x\right)= $$

A

$y_2 \cos ^2 x$

B

$y_2 \sin ^2 x$

C

$y_1 \sin ^2 x$

D

$y \sin ^2 x$