Question Number 164904 by Zaynal last updated on 23/Jan/22
$$\int_{\mathrm{0}} ^{\infty} \:\frac{\mathrm{cos}^{−\mathrm{1}} \:.\left(\boldsymbol{{x}}\right)}{\boldsymbol{\mathrm{I}}\mathrm{n}\:\left(\left(\boldsymbol{{x}}\right)\:−\:\mathrm{3}^{\left(\boldsymbol{{x}}^{\mathrm{2}} −\mathrm{1}\right)} \right)}\:\boldsymbol{{dx}} \\ $$$$\left\{\boldsymbol{{z}}.\boldsymbol{{a}}\right\} \\ $$