My Table of Integrals has the overall case ##int frac dx x^two+a^2 ## for a 'common' integral as well, not merely the case where by ##a=1##. But I feel this getting a Calculus research difficulty it is predicted in the OP to determine how to do it. Hints got above. https://gabletoppak.com/elevate-your-brand-with-gable-top-paks-white-label-water-packaging/