- #1
mbrmbrg
- 496
- 2
I'm in the middle of solving [tex]\int\sqrt{x^2+9}dx[/tex] and I got it into the form of [tex]3\int\sec^3\theta d\theta[/tex], and I'm pulling a blank. Where does one begin? I could integrate by parts, setting u=sec(theta) and dv=sec^2(theta), but it's not getting me very far. Any suggestions?