My table of Integrals has the overall scenario ##int frac dx x^two+a^two ## for a 'conventional' integral far too, not just the case wherever ##a=one##. But I think this currently being a Calculus research problem it is anticipated with the OP to determine how to do it. Hints were given https://gabletoppak.com/boost-brand-visibility-with-customized-packaged-drinking-water/