MCQ
$\int_0^{\frac{\pi}{2}} \frac{\sin ^n x}{\sin ^n x+\cos ^n x} d x=$ _________.
- A$\frac{\pi}{4}$
- B$\frac{\pi}{3}$
- C$\frac{\pi}{2}$
- D$\pi$
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Surface area times the rate of change of diameter.
Surface area times the rate of change of radius.
None of these.