Question Number 145635 by mathmax by abdo last updated on 06/Jul/21
$$\mathrm{calculate}\:\int_{\mathrm{0}} ^{\infty} \:\frac{\mathrm{arctan}\left(\mathrm{3x}^{\mathrm{2}} \right)}{\mathrm{1}+\mathrm{x}^{\mathrm{2}} }\mathrm{dx} \\ $$
calculate-0-arctan-3x-2-1-x-2-dx-