$\left(ax\right)^3\cdot\left(ax\right)^2\cdot ax$

$\frac{u^2+2u+2}{u^2+u}$

$\frac{x^{3}-7x^{2}+15x-9}{x^{3}-5x^{2}+3x+9}$

$\left(w-4\right)\left(y-8w\right)$

$\frac{d}{dx}\:\frac{1}{x^2+9x}$

$-\left(-6\right)+\left(8\right)$

$\lim_{x\to0}\left(\frac{1-\cos\left(7x\right)}{7x^3}\right)$