Question Number 138971 by mathmax by abdo last updated on 20/Apr/21
$$\mathrm{calculate}\:\int_{\mathrm{0}} ^{\infty} \:\frac{\mathrm{arctan}\left(\mathrm{x}^{\mathrm{2}} −\mathrm{1}\right)}{\mathrm{x}^{\mathrm{2}} +\mathrm{4}}\mathrm{dx} \\ $$
calculate-0-arctan-x-2-1-x-2-4-dx-