My table of Integrals has the overall situation ##int frac dx x^two+a^two ## as a 'typical' integral as well, not only the situation where by ##a=1##. But I feel this becoming a Calculus homework challenge it is predicted from the OP to figure out how to get it done. Hints https://gabletoppak.com/the-benefits-of-switching-to-sustainable-milk-cartons-today/