Question:
Mark $(\sqrt{)}$ against the correct answer in each of the following:
$\int \cos 4 x \cos x d x=?$
A. $\frac{1}{5} \sin 5 x+\frac{1}{3} \sin 3 x+C$
B. $\frac{1}{5} \cos 5 x-\frac{1}{3} \cos 3 x+C$
C. $\frac{1}{10} \sin 5 x+\frac{1}{6} \sin 3 x+C$
D. None of these
Solution:
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