$\left(x^2-12\right)\left(x^2+2\right)$

$\frac{\csc\left(x\right)^3}{-3}+csc\left(x\right)$

$\frac{dy\cdot y}{dx}=-1$

$x^4-144$

$-6\left(a^2-3a+7\right)$

$\frac{2x^5y^4}{8y^5}$

$\frac{1-\sin\left(x\right)}{\cos\left(x\right)}+\frac{\cos\left(x\right)}{1-\sin\left(x\right)}=2\cos\left(x\right)$