My desk of Integrals has the overall situation ##int frac dx x^2+a^2 ## to be a 'typical' integral also, not just the situation exactly where ##a=one##. But I think this remaining a Calculus homework problem it is anticipated from the OP to determine how to do it. Hints got above. https://gabletoppak.com/the-benefits-of-switching-to-sustainable-milk-cartons-today/