My desk of Integrals has the general situation ##int frac dx x^2+a^2 ## for a 'conventional' integral far too, not simply the situation wherever ##a=one##. But I feel this remaining a Calculus research problem it is expected in the OP to figure out how to get it done. Hints were https://gabletoppak.com/kerala-get-ready-to-say-no-to-plastic-from-october-2/