My table of Integrals has the final circumstance ##int frac dx x^two+a^2 ## as being a 'common' integral much too, not just the case the place ##a=one##. But I do think this being a Calculus homework difficulty it is anticipated with the OP to figure out how to do it. https://gabletoppak.com/elevate-your-brand-with-gable-top-paks-white-label-water-packaging/