My table of Integrals has the overall circumstance ##int frac dx x^2+a^2 ## being a 'regular' integral much too, not merely the situation the place ##a=1##. But I do think this staying a Calculus research dilemma it is expected on the OP to figure out how to do it. Hints https://gabletoppak.com/why-every-home-should-use-long-lasting-oil-storage-cartons-for-daily-cooking/