My table of Integrals has the general situation ##int frac dx x^2+a^2 ## being a 'common' integral way too, not just the situation where by ##a=one##. But I feel this currently being a Calculus homework dilemma it is predicted from the OP to figure out how to make it happen. https://gabletoppak.com/why-white-label-water-bottles-are-a-game-changer-for-your-brand/