My table of Integrals has the general case ##int frac dx x^2+a^2 ## like a 'normal' integral also, not simply the situation in which ##a=1##. But I believe this being a Calculus homework issue it is predicted in the OP to determine how to make it happen. Hints got previously https://gabletoppak.com/chikkamagaluru-dc-to-declare-mullayyanagiri-hill-station-plastic-free-zone-on-world-earth-day/