My desk of Integrals has the final circumstance ##int frac dx x^2+a^two ## for a 'standard' integral also, not simply the situation wherever ##a=one##. But I do think this remaining a Calculus research problem it is predicted with the OP to determine how to do it. Hints got higher than. https://gabletoppak.com/glass-bottles-for-beer-soda-and-even-water-found-to-contain-toxic-levels-of-cancer-linked-microplastics-than-plastic-bottles-study-says/