My desk of Integrals has the final circumstance ##int frac dx x^2+a^2 ## for a 'regular' integral much too, not simply the situation the place ##a=1##. But I do think this staying a Calculus homework problem it is anticipated on the OP to determine how to do it. Hints were https://gabletoppak.com/supporting-sdg-14-life-below-water-through-sustainable-edible-oil-packaging-with-gabletop-cartons/