My table of Integrals has the final case ##int frac dx x^2+a^two ## as being a 'common' integral as well, not merely the case in which ##a=one##. But I do think this becoming a Calculus homework difficulty it is anticipated from the OP to figure out how to do it. https://gabletoppak.com/chikkamagaluru-dc-to-declare-mullayyanagiri-hill-station-plastic-free-zone-on-world-earth-day/