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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