My Desk of Integrals has the overall situation ##int frac dx x^two+a^two ## as being a 'standard' integral as well, not merely the case the place ##a=one##. But I think this being a Calculus homework issue it is predicted in the OP to figure out how to get it done. https://gabletoppak.com/free-water-advertising-a-sustainable-and-emotional-path-to-powerful-brand-recognition/