Question:
Mark $(\sqrt{ })$ against the correct answer in the following:
$\int_{0}^{\pi / 6} \cos x \cos 2 x d x=?$
A. $\frac{1}{4}$
B. $\frac{5}{12}$
C. $\frac{1}{3}$
D. $\frac{7}{12}$
Solution:
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