Question Number 118476 by mathmax by abdo last updated on 17/Oct/20
$$\mathrm{find}\:\int_{−\infty} ^{\infty} \:\frac{\mathrm{arctan}\left(\mathrm{1}+\mathrm{2x}\right)}{\mathrm{x}^{\mathrm{2}} \:+\mathrm{1}}\mathrm{dx} \\ $$
find-arctan-1-2x-x-2-1-dx-