My desk of Integrals has the final case ##int frac dx x^2+a^2 ## being a 'typical' integral too, not only the case the place ##a=one##. But I do think this being a Calculus homework challenge it is expected with the OP to figure out how to get it done. Hints https://gabletoppak.com/how-white-labeling-water-bottles-can-elevate-your-brand-identity/