$\left(x+4\right)\left(x+8\right)\left(x-12\right)\left(x+16\right)$

$\frac{-5a+4}{-3}$

$-3\left[2x-\left(x+7\right)\right]$

$\left(\frac{1}{3}xy-z^6\right)\left(\frac{1}{3}xz+z^6\right)$

$\frac{dy}{dx}+y=e^x,\:y\left(0\right)=1$

$\left(2x-y\right)^2-\left(2x-y\right)\left(2x+2f\right)+\left(x+f\right)^2$

$\int\left(2x-1\right)e^{x^2-x}dx$