My desk of Integrals has the final circumstance ##int frac dx x^two+a^2 ## as being a 'conventional' integral too, not just the case the place ##a=one##. But I believe this staying a Calculus research dilemma it is anticipated in the OP to determine how to get it done. Hints got https://gabletoppak.com/supporting-sdg-14-life-below-water-through-sustainable-edible-oil-packaging-with-gabletop-cartons/