My desk of Integrals has the general case ##int frac dx x^two+a^2 ## for a 'standard' integral too, not just the case where by ##a=one##. But I think this staying a Calculus homework dilemma it is anticipated on the OP to determine how to make it happen. Hints got over. https://gabletoppak.com/customized-mineral-water-bottles-and-packaged-drinking-water-the-future-of-sustainable-packaging-at-gabletop-pak/