$\frac{\left(xy^{-5}\right)^{-5}}{\left(x^{-5}y\right)^{-6}}$

$25w^6+90w^3u+81u^2$

$\frac{3\sqrt{a}}{\sqrt{a}\:-2}$

$11a\:+\:8a\:+\:9a\:+\:11a\:$

$\int\left(7e^{-5y}\left(3+e^{-5y}\right)^3\right)dy$

$\sin\left(b\:\right)\cos\left(b\right)=\tan\left(b\right)$

$\left(7x^2-2y\right)\left(49x^4\right)$