My table of Integrals has the general situation ##int frac dx x^two+a^2 ## like a 'common' integral also, not only the situation the place ##a=1##. But I feel this becoming a Calculus homework problem it is anticipated of your OP to figure out how to do it. Hints got over. https://gabletoppak.com/travel-green-gabletop-paks-sustainable-shift/