My desk of Integrals has the general situation ##int frac dx x^two+a^two ## as a 'common' integral as well, not simply the situation where ##a=1##. But I do think this currently being a Calculus research problem it is expected on the OP to determine how to make it happen. Hints https://gabletoppak.com/travel-green-gabletop-paks-sustainable-shift/