$\sqrt[3]{216n^6}$

$\cos\left(a\right)^2-\sin\left(a\right)^2=2\cos\left(a\right)-1$

$tan^{-1}\left(\frac{2}{3}\right)-\:tan^{-1}\left(\frac{x}{5}\right)=\:\frac{\pi}{4}$

$\frac{dy}{dx}=-5\cos\left(6x\right)$

$6\left(13-\frac{9x}{5}\right)$

$\int ln11xdx$

$-2<\frac{4-3x}{5}$