My table of Integrals has the final situation ##int frac dx x^2+a^two ## to be a 'regular' integral far too, not merely the situation in which ##a=1##. But I feel this being a Calculus homework difficulty it is expected in the OP to figure out how to do it. Hints https://gabletoppak.com/kerala-get-ready-to-say-no-to-plastic-from-october-2/