I'm betting I have to solve it using partial fractions : . So I found , , and and I reached to that the solution must be equal to . And I'm stuck here! This last integral looks quite simple I know, and is very similar to , but I don't know how to solve it. I tried by integration by parts, u-substitution. Should I try for trigonometric substitution? If yes, please start me up making a good choice for the sub. I'm not used to trigo-sub... Thanks.