$\frac{d^3}{dx^3}\left(12x^3-36x^2\right)$

$4x^2+y^2=8$

$\frac{dy}{dx}=\frac{14xy}{\left(\ln\left(y\right)\right)^4}$

$9y-z-2y+5x-8z-7y$

$4+\left(x+2\right)\cdot\left(x^2+4x\right)$

$\frac{d^3y^2}{6}+c=\left(-e^{-x}+c\right)$

$\left(3a^3\right)^2+2\cdot3a^3\cdot x+\left(x^2\right)^2$