I have a TI-89 Titanium which I love, but it takes forever to find the definite integrals to certain problems. And by forever, I literally mean 10+ minutes.

It generally occurs when I'm calculating things like the surface area of a curve rotated around an axis. When I take a definite integral with the square root of trigonometric functions, I tend to have problems.

Any tips? Or am I just screwed?