$\left(2m-n\right)\left(3m^2+7mn-n^2\right)$

$\frac{8\tan^3+1}{8tan^3-4\tan^2+2\tan}$

$\frac{2}{3}xy-xy$

$\lim_{x\to\infty}\left(\frac{16x^2-6x-5}{8x^2-5x+4}\right)$

$\frac{d^2}{dx^2}4\sin^3\left(6x\right)$

$\frac{x^2-3x+2}{2}$

$\left(x+2\right)\cdot\left(x+1\right)\cdot\left(x+1\right)\cdot x\cdot\left(x-1\right)^3\cdot\left(x-2\right)$