My table of Integrals has the overall circumstance ##int frac dx x^2+a^2 ## like a 'standard' integral as well, not merely the situation wherever ##a=1##. But I believe this currently being a Calculus research dilemma it is expected in the OP to figure out how to do it. Hints got https://gabletoppak.com/bioplastics-greenwashing-or-genuine-solution-the-truth-behind-the-hype/