Question Number 20456 by tammi last updated on 27/Aug/17
$$\int\mathrm{cot}\:^{\mathrm{4}} {xdx} \\ $$
Commented by Joel577 last updated on 27/Aug/17
$${use}\:\mathrm{cot}^{\mathrm{2}} \:{x}\:=\:\mathrm{cosec}^{\mathrm{2}} \:{x}\:−\:\mathrm{1} \\ $$