$\left(8a^2-b\right)\left(-2ab^2\right)$

$\frac{x^2+2x}{x+1}$

$\left(4a-3y\right)^2$

$\frac{dy}{dx}\left(\sqrt{\frac{x^2}{x+1}}\right)\:$

$\left(b^3-m^4\right)\left(b^3+m^4\right)$

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

$\lim_{x\to0}\left(\frac{2x-\pi}{\cos x}\right)$