Question

$integral {cos}^{2} xdx$

Answer 1

$\int\limits {cos^2x} \, dx \\\\\int\limits {\frac{1}{2}.(1+cos(2x))} \, dx\\\\\int\limits {\frac{1}{2}+\frac{cos(2x)}{2}} \, dx\\\\\frac{1}{2}x+\frac{1}{4}sen(2x)$