My desk of Integrals has the general circumstance ##int frac dx x^two+a^2 ## to be a 'standard' integral too, not simply the case where ##a=1##. But I feel this being a Calculus research dilemma it is expected in the OP to determine how to make it happen. Hints got earlier https://gabletoppak.com/kerala-get-ready-to-say-no-to-plastic-from-october-2/