My Table of Integrals has the overall scenario ##int frac dx x^two+a^two ## for a 'common' integral way too, not only the case where by ##a=one##. But I believe this becoming a Calculus homework trouble it is anticipated in the OP to figure out how to make it happen. Hints https://gabletoppak.com/a-revolutionary-step-towards-sustainable-water-bottle-packaging/