My desk of Integrals has the general case ##int frac dx x^two+a^two ## being a 'common' integral way too, not only the case where ##a=one##. But I feel this getting a Calculus homework problem it is predicted from the OP to figure out how to make it happen. Hints were https://gabletoppak.com/why-i-switched-to-water-in-a-sustainable-box/