Question Number 134667 by benjo_mathlover last updated on 06/Mar/21
$$\mathcal{G}\:=\:\int_{\mathrm{0}} ^{\:\pi/\mathrm{2}} \:\mathrm{arccos}\:\left(\frac{\mathrm{cos}\:\mathrm{x}}{\mathrm{1}+\mathrm{2cos}\:\mathrm{x}}\right)\:\mathrm{dx}\: \\ $$
Commented by LUFFY last updated on 06/Mar/21
$${search}\:\mathrm{C}{oxeter}'{s}\:{integral} \\ $$