My table of Integrals has the overall case ##int frac dx x^two+a^2 ## as a 'common' integral far too, not only the situation in which ##a=one##. But I think this being a Calculus research problem it is anticipated on the OP to figure out how to get it done. Hints https://gabletoppak.com/how-white-labeling-water-bottles-can-elevate-your-brand-identity/