My desk of Integrals has the general case ##int frac dx x^two+a^2 ## to be a 'conventional' integral also, not just the situation exactly where ##a=1##. But I believe this currently being a Calculus homework problem it is anticipated from the OP to figure out how to make it happen. https://gabletoppak.com/bioplastics-greenwashing-or-genuine-solution-the-truth-behind-the-hype/