Question:
Mark $(\sqrt{)}$ against the correct answer in each of the following:
$\int x \cos ^{2} x d x=?$
A. $\frac{x^{2}}{4}-\frac{x \sin 2 x}{4}+\frac{\cos 2 x}{8}+C$
B. $\frac{x^{2}}{4}+\frac{x \sin 2 x}{4}+\frac{\cos 2 x}{8}+C$
C. $\frac{x^{2}}{4}+\frac{x \sin 2 x}{4}-\frac{\cos 2 x}{8}+C$
D. none of these
Solution:
