My table of Integrals has the final situation ##int frac dx x^2+a^two ## like a 'typical' integral too, not only the case wherever ##a=one##. But I do think this becoming a Calculus homework dilemma it is predicted with the OP to figure out how to make it happen. Hints were https://gabletoppak.com/kerala-get-ready-to-say-no-to-plastic-from-october-2/