Question Number 127715 by snipers237 last updated on 01/Jan/21
$$\:\int_{\frac{\pi}{\mathrm{2}}} ^{\frac{\mathrm{2}\pi}{\mathrm{3}}} \:\:\frac{\left({argshx}\right)^{\mathrm{2}} }{\mathrm{2}{cosx}}\:{dx}\:=\:? \\ $$
pi-2-2pi-3-argshx-2-2cosx-dx-