My table of Integrals has the overall scenario ##int frac dx x^two+a^two ## as a 'regular' integral way too, not simply the situation where by ##a=one##. But I believe this being a Calculus research issue it is predicted of your OP to determine how to make it happen. Hints got https://gabletoppak.com/kerala-get-ready-to-say-no-to-plastic-from-october-2/