My desk of Integrals has the overall situation ##int frac dx x^two+a^two ## being a 'standard' integral also, not simply the case in which ##a=1##. But I do think this getting a Calculus homework difficulty it is predicted of your OP to figure out how to get it done. Hints https://gabletoppak.com/how-white-label-water-bottles-can-skyrocket-your-business/