My desk of Integrals has the general case ##int frac dx x^two+a^two ## for a 'normal' integral far too, not merely the situation wherever ##a=one##. But I feel this staying a Calculus research dilemma it is anticipated on the OP to figure out how to do it. Hints were given https://gabletoppak.com/customized-mineral-water-bottles-and-packaged-drinking-water-the-future-of-sustainable-packaging-at-gabletop-pak/