My desk of Integrals has the overall case ##int frac dx x^two+a^2 ## to be a 'common' integral also, not just the situation exactly where ##a=one##. But I believe this being a Calculus homework problem it is anticipated from the OP to determine how to do it. Hints got over. https://gabletoppak.com/how-white-labeling-water-bottles-can-elevate-your-brand-identity/