$\left(8cg^3x\right)^4$

$s^{-6}t^{-1}u^3.s^{-6}t^6u.s^{-4}t^9u^{-5}$

$\lim_{x\to4}\frac{\left|4-x\right|}{\left(16-x^2\right)^2}$

$\left(m-3n\right)^4$

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

$5\tan x+\sqrt{3}=2\tan\left(x\right)$

$\cot\left(x\right)^2-2\csc\left(x\right)^2=-5$