$-20x^2+2800x$

$\tan^3\left(x\right)=\frac{3\tan\left(x\right)-\tan^2\left(x\right)}{1-3\tan^2\left(x\right)}$

$\int\left(\sqrt{a}-\sqrt{t}\right)^3dt$

$\left(3+-2x\right)^4$

$\lim_{x\to0}\left(3x-\cos\left(x\right)\right)^{\frac{1}{x}}$

$\frac{x^8y^9}{x^5y^2}$

$\frac{3x+21}{7x-6}\cdot\frac{2x-8}{x+7}$