$9m-\frac{6}{-3}$

$\lim_{x\to90}\left(\frac{tan\left(x\right)}{tan\left(5x\right)}\right)$

$\frac{m^2}{9}-\frac{16n^4}{81}$

$\left(8-2x\right)\left(5-2x\right)$

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

$\frac{dy}{dx}=\sqrt[3]{y\left(x\right)}$

$\int\frac{e^{3t}+e^t}{\left(e^t-1\right)}dt$