The answer in the book is 1/4. I googled, and secant cubed is integration by parts. Before I went through all that, suspecting I set something up incorrectly, I used my ti-89 to calculate a numeric estimate. The number is negative and is not of the magnitude 1/4. What did I do wrong? Edit: My picture says tan when it should say arctan.

http://img182.imageshack.us/img182/7363/29455721.jpg