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Difficult

Integral Of $(\cos x)^2$

APCALC-EEKUWK

Evaluate the integral:

$$\int { \cos ^{ 2 }{ xdx } } $$

A

$\cfrac{1}{2}x-\cfrac{1}{4}\sin { 2x } +C$

B

$\cfrac{1}{2}x+\cfrac{1}{2}\sin { 2x } +C$

C

$\cfrac{1}{2}x-\cfrac{1}{2}\sin { 2x } +C$

D

$\cfrac{1}{2}x+\cfrac{1}{4}\sin { 2x } +C$