$2x^5-128x$

$\left(x+5\right)^2\left(x-5\right)^2$

$\frac{107.6}{120}$

$\frac{\cos\:\left(4\theta\right)}{\sin\:\left(\theta\right)}-\frac{\sin\:\left(4\theta\right)}{\cos\:\left(\theta\right)}=\frac{\cos\:\left(5\theta\right)}{\sin\:\left(\theta\right)\cos\:\left(\theta\right)}$

$36x^2-4x+16$

$\left(y+2\right)+\left(y+2\right)+\left(y+2\right)+\left(y+2\right)$

$\frac{\sqrt{3}+1}{-\sqrt{3}-1}$