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**[SOLVED] Frouier series problem**

Lately I took Frouier series...

**1. Homework Statement**

Find the Fourier series of the function below which is assumed to have the period 2 [tex]\pi[/tex], and find the first three partial sums.

http://www.imagehosting.com/out.php/i1650739_untitled.JPG

**2. Homework Equations**

**3. The Attempt at a Solution**

I used office 2007 to write my solution....and here they are hosted as a picture..

http://www.imagehosting.com/out.php/i1650792_untitled1.JPG

I see my answer not correct, I hope someone helps me..Thanks

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