My table of Integrals has the general case ##int frac dx x^two+a^two ## being a 'common' integral also, not only the case where ##a=one##. But I feel this getting a Calculus homework problem it is predicted with the OP to figure out how to do it. Hints got earlier mentioned. https://gabletoppak.com/bioplastics-greenwashing-or-genuine-solution-the-truth-behind-the-hype/