$\left(\frac{1}{2}+a\right)^5$

$\frac{x^2+4x-8}{x+3}$

$\sqrt{720}$

$\left(2x-8\right)\left(4x+2\right)$

$\frac{2b^4}{b^{-3}\cdot2ab^{-2}}$

$\frac{1}{\cos\left(x\right)+\sin\left(x\right)\cos\left(x\right)}=\frac{1-\sin\left(x\right)}{\cos^3\left(x\right)}$

$\frac{dy}{dx}=4-3x^2$