My table of Integrals has the final scenario ##int frac dx x^two+a^2 ## as a 'common' integral much too, not only the case wherever ##a=1##. But I do think this becoming a Calculus homework dilemma it is predicted from the OP to figure out how to get it done. Hints https://gabletoppak.com/chikkamagaluru-dc-to-declare-mullayyanagiri-hill-station-plastic-free-zone-on-world-earth-day/