My Desk of Integrals has the final circumstance ##int frac dx x^two+a^two ## for a 'standard' integral as well, not only the case in which ##a=1##. But I believe this currently being a Calculus research dilemma it is anticipated with the OP to determine how to get it done. Hints https://gabletoppak.com/sustainable-soap-packaging-benefits-for-indian-consumers/