- #1

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**not allowed**to use built in functions for integrating in Mathematica.

This is my code that won't work:

http://pokit.org/get/?93856fe8f2070ba781028f8634b9ac3a.jpg

This is a code from a friend that works:

http://pokit.org/get/?d712a81fb8c3078f4d8ad60a43b7bf0e.jpg

We are both using Wolfram Mathematica 8.0. I don't know what's wrong with my code, and why I can't obtain a normal numerical result?