My table of Integrals has the overall scenario ##int frac dx x^two+a^two ## for a 'typical' integral way too, not only the case where by ##a=one##. But I believe this becoming a Calculus research challenge it is anticipated from the OP to determine how to get it done. Hints were https://gabletoppak.com/sustainable-liquid-soap-packaging-why-gabletop-cartons-are-the-eco-friendly-choice/