My table of Integrals has the general situation ##int frac dx x^2+a^2 ## like a 'typical' integral much too, not merely the situation where by ##a=one##. But I do think this being a Calculus research problem it is expected of the OP to figure out how to do it. Hints https://gabletoppak.com/hc-issues-notice-over-plea-to-make-dwarka-plastic-free/