My table of Integrals has the final case ##int frac dx x^two+a^2 ## for a 'standard' integral far too, not simply the situation exactly where ##a=one##. But I believe this remaining a Calculus homework dilemma it is predicted from the OP to figure out how to do it. Hints were https://gabletoppak.com/is-bottled-water-a-healthy-choice/