^2 d x is equal to: - Vidyadip

Question

$\int \cos ^2 d x$ is equal to:

✓

Answer

Let $I =\int \cos ^2 d x$
$=\int \frac{1+\cos 2 x}{2} d x$
$=\frac{1}{2} x+\frac{1}{4} \sin 2 x+C$

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