Question Number 181851 by SEKRET last updated on 01/Dec/22
$$\:\:\:\int\:\boldsymbol{\mathrm{arccos}}\left(\boldsymbol{\mathrm{tg}}^{\mathrm{3}} \left(\boldsymbol{\mathrm{tg}}\left(\boldsymbol{\mathrm{x}}\right)\right)\right)\:\boldsymbol{\mathrm{dx}}=? \\ $$