My table of Integrals has the general circumstance ##int frac dx x^two+a^2 ## to be a 'common' integral also, not simply the situation where by ##a=one##. But I do think this being a Calculus homework issue it is expected in the OP to figure out how to get it done. https://gabletoppak.com/a-revolutionary-step-towards-sustainable-water-bottle-packaging/