∫ cos ( x ) sin 2 ( x ) d x {\displaystyle \int {\frac {\cos {(x)}}{\sin ^{2}{(x)}}}dx}
u = sin ( x ) d u = cos ( x ) d x {\displaystyle {\begin{aligned}u&=\sin {(x)}\\[2ex]du&=\cos {(x)}dx\end{aligned}}}
![{\displaystyle {\begin{aligned}u&=\sin {(x)}\\[2ex]du&=\cos {(x)}dx\end{aligned}}}](https://en.wikipedia.org/api/rest_v1/media/math/render/svg/c9371c8d0e54e3be6eb14d031c53b463708cc897)