My table of Integrals has the final situation ##int frac dx x^2+a^two ## being a 'standard' integral way too, not simply the case where ##a=one##. But I do think this remaining a Calculus homework problem it is predicted of the OP to figure out how to get it done. Hints https://gabletoppak.com/how-gabletop-cartons-are-helping-water-brands-combat-climate-change/