$\left(4c^3d\right)\left(-5c^2d^7\right)$

$\frac{dy}{dx}=\sqrt{1-y^2}\frac{d^2y}{dx^2}$

$\left(x\:+\:8\right)\left(x\:+\:4\right)$

$\int\frac{1}{y\left(2-y\right)\left(4-y\right)}dy$

$\lim_{x\to0}\left(\frac{\sqrt{x}}{\sqrt{x+7}}\right)$

$\int\frac{x^2+1}{\left(x-1\right)\left(x^2+9\right)}dx$

$2\cdot\left(x-1\right)\ge8$