My table of Integrals has the overall circumstance ##int frac dx x^2+a^2 ## for a 'regular' integral way too, not just the case the place ##a=one##. But I think this getting a Calculus research problem it is expected on the OP to determine how to do it. Hints were given https://gabletoppak.com/chikkamagaluru-dc-to-declare-mullayyanagiri-hill-station-plastic-free-zone-on-world-earth-day/