- #1
ensten
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Homework Statement
[itex]
h(x)=\left\{\begin{matrix}
9+2x , 0<x<\pi\\ -9+2x , -pi<x<0
\end{matrix}\right.
\\
Find \ the \ sum \ of \ the \ Fourier \ series \ for \ x=\frac{3\pi}{2} and\ x=\pi
\\
The \ Fourier \ series \ is:
\\
h(x)=9+\pi + \sum_{n=1}^{inf} \frac{18-2(9+2\pi)(-1)^2}{n\pi}sin(nx)
[/itex]
Also period is 2pi.
The Attempt at a Solution
I have already calculated the Fourier series. I however don't know how I can find the sum for the x's. I have searched the internet and looked in my book but I can't find any examples that help me. I'm stuck and don't know how to go from here.