My table of Integrals has the overall scenario ##int frac dx x^two+a^two ## as being a 'common' integral much too, not just the case in which ##a=one##. But I feel this remaining a Calculus homework issue it is anticipated on the OP to figure out how to do it. Hints https://gabletoppak.com/bioplastics-greenwashing-or-genuine-solution-the-truth-behind-the-hype/