My table of Integrals has the overall scenario ##int frac dx x^two+a^two ## to be a 'typical' integral way too, not just the situation in which ##a=1##. But I feel this becoming a Calculus homework challenge it is expected of your OP to figure out how to do it. Hints https://gabletoppak.com/how-white-label-water-bottles-can-skyrocket-your-business/