$\left(h^{-1}\right)^{-9}$

$\frac{1}{x}+1$

$\lim_{x\to\infty}\left(ln3x-ln\left(x+2\right)\right)$

$\left(x+7\right)+\left(x+7\right)+\left(x+7\right)+\left(x-2\right)+\left(x-2\right)+\left(x+2\right)+\left(x+2\right)+\left(x-5\right)+\left(x-5\right)$

$\left(x^2-6x\right)+\left(\left(x^2-6x\right)-6\right)$

$4\frac{d^2u}{dy^2}-4\frac{du}{dy}+u=0$

$\sin\left(a\right)\cot^2\left(a\right)$