$\left(w^4x^{-5}\right)\left(w^{-2}x^{-4}\right)$

$\frac{cosxcotx}{csc^2-1}$

$\tan w\csc w$

$x^2+2x-18$

$\frac{d}{dx}\left(\left(x^2\right)cos\left(x^2\right)\right)$

$\frac{dy}{dx}+\left(x+1\right)\left(y^3\right)=0$

$\left[\left(3x^2y-5z\right)-7\right]\:\left[\left(3x^2y-5z\right)+7\right]$