Question:
Mark $(\sqrt{)}$ against the correct answer in the following:
$\int_{0}^{\pi / 2} \sin x \sin 2 x d x=?$
A. $\frac{2}{3}$
B. $\frac{3}{4}$
C. $\frac{5}{6}$
D. $\frac{3}{5}$
Solution:
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