My Desk of Integrals has the final circumstance ##int frac dx x^two+a^two ## as a 'regular' integral also, not simply the case where by ##a=1##. But I think this staying a Calculus homework problem it is expected in the OP to determine how to make it happen. Hints got earlier https://gabletoppak.com/customized-packaged-drinking-water-with-your-brand-logo/