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

$\left(\frac{-2}{-3}\right)^{-5}$

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

$\frac{dy}{dx}=\frac{4}{1-16x^2}$

$\frac{\tan\left(23^{\circ}\right)}{\cot\left(23^{\circ}\right)}-\frac{1}{\sin^2\left(67^{\circ}\right)}$

$\left(-1\:+\frac{4k}{n}\right)^2$

$\left(1+h\right)^2$