My table of Integrals has the overall scenario ##int frac dx x^2+a^2 ## like a 'standard' integral also, not simply the situation the place ##a=one##. But I do think this currently being a Calculus homework trouble it is predicted on the OP to figure out how to do it. Hints https://gabletoppak.com/travel-green-gabletop-paks-sustainable-shift/