My Table of Integrals has the overall circumstance ##int frac dx x^2+a^2 ## being a 'standard' integral way too, not merely the case in which ##a=1##. But I believe this staying a Calculus homework issue it is anticipated of the OP to figure out how to make it happen. Hints https://gabletoppak.com/the-growing-threat-of-marine-pollution-and-how-gabletop-cartons-offer-a-solution/