My table of Integrals has the final situation ##int frac dx x^two+a^2 ## for a 'standard' integral too, not only the situation exactly where ##a=one##. But I feel this being a Calculus homework trouble it is anticipated from the OP to figure out how to do it. Hints got over. https://gabletoppak.com/edible-oil-in-gabletop-pak/