1
MHT CET 2025 5th May Evening Shift
MCQ (Single Correct Answer)
+2
-0

$\int \frac{\sin 7 x}{\cos 9 x \cos 2 x} \mathrm{~d} x$ is equal to

A

$\log \sec (9 x)-\log \sec (2 x)+\mathrm{c}$, where c is the constant of integration

B

$\log \sec (9 x)+\log \sec (2 x)+\mathrm{c}$, where c is the constant of integration

C

$\frac{1}{9} \log \sec (9 x)-\frac{1}{2} \log \sec (2 x)+\mathrm{c}$, where c is the constant of integration

D

$\frac{1}{9} \log \sec (9 x)+\frac{1}{2} \log \sec (2 x)+\mathrm{c}$, where c is the constant of integration

2
MHT CET 2025 5th May Evening Shift
MCQ (Single Correct Answer)
+2
-0

The solution of the equation $\frac{\mathrm{d} y}{\mathrm{~d} x}=\frac{1}{x+y+1}$ is

A

$x=\log (x+y+2)+\mathrm{c}$, where c is the constant of integration

B

$x=\log (x+y-2)+\mathrm{c}$, where c is the constant of integration

C

$y=\log (x+y+2)+c$, where $c$ is the constant of integration

D

$y=\log (x+y-2)+\mathrm{c}$, where c is the constant of integration

3
MHT CET 2025 5th May Evening Shift
MCQ (Single Correct Answer)
+2
-0

A spherical balloon is filled with $4500 \pi$ cubic meters of helium gas. If a leak in the balloon causes the gas to escape at the rate of $72 \pi$ cubic meters per minute, then the rate (in meters per minute) at which the radius of the balloon decreases 49 minutes after the leakage has begun, is

A
$\frac{9}{7}$
B
$-\frac{2}{9}$
C
$\frac{9}{2}$
D
$\frac{2}{9}$
4
MHT CET 2025 5th May Evening Shift
MCQ (Single Correct Answer)
+2
-0

If $x \cdot \log _e\left(\log _e x\right)-x^2+y^2=4(y>0)$, then $\frac{d y}{d x}$ at $x=\mathrm{e}$ is

A
$\frac{\mathrm{e}}{\sqrt{4+\mathrm{e}^2}}$
B
$\quad \frac{2 \mathrm{e}-1}{2 \sqrt{4+\mathrm{e}^2}}$
C
$\frac{1+2 e}{\sqrt{4+e^2}}$
D
$\quad \frac{1+2 \mathrm{e}}{2 \sqrt{4+\mathrm{e}^2}}$

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