My desk of Integrals has the final circumstance ##int frac dx x^two+a^two ## for a 'typical' integral way too, not only the case where ##a=one##. But I believe this being a Calculus research problem it is expected on the OP to determine how to get it done. Hints were given https://gabletoppak.com/chikkamagaluru-dc-to-declare-mullayyanagiri-hill-station-plastic-free-zone-on-world-earth-day/