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**1. Homework Statement**

I need help finding the exponential Fourier series for the pulse train below.

http://img329.imageshack.us/img329/1184/20080427091409ev5.jpg [Broken]

**2. Homework Equations**

[tex]p_T(t)=\sum_{n=-\infty}^{\infty}{D_n e^{j2nt}[/tex]

[tex]D_n=\frac{1}{T_0}\int_{T_0}^{}{x(t)e^{-j2nt}dt}[/tex]

**3. The Attempt at a Solution**

http://img74.imageshack.us/img74/2376/20080427093457iy6.jpg [Broken]

I know that D0=0.2. However, I cannot evaluate my final answer for n=0 because I have n in the denominator. Where am I going wrong?

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