Mark against the correct answer in the following:

Question:

Mark $(\sqrt{ })$ against the correct answer in the following:

$\int_{0}^{\pi / 2} \sin ^{2} x d x=?$

A. $\frac{\pi}{3}$

B. $\frac{\pi}{4}$

C. $\frac{\pi}{2}$

D. $\frac{2 \pi}{3}$

Solution:

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