My table of Integrals has the overall scenario ##int frac dx x^two+a^two ## as a 'normal' integral way too, not simply the case where ##a=one##. But I think this being a Calculus homework problem it is predicted of your OP to figure out how to make it happen. Hints were https://gabletoppak.com/boost-your-brand-with-premium-white-label-water-bottles/