My desk of Integrals has the final circumstance ##int frac dx x^2+a^two ## like a 'normal' integral much too, not only the case where ##a=1##. But I think this being a Calculus homework challenge it is predicted from the OP to figure out how to do it. Hints got over. https://gabletoppak.com/how-white-labelled-water-elevated-business-image/