# Find the value of x of the fourier series defined by

1. Apr 28, 2015

### Zaent

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution
http://imgur.com/7TRWjBg

I don't really get what it's asking. I don't know how to define a fourier series when the boundaries for X are between non-multiples of Pi. On top of that, it has one boundary that has 4<x<2Pi. How can it be between 4 and 2 Pi? My attempt at a solution seems like it has to be totally the wrong way to go about it

2. Apr 28, 2015

### LCKurtz

Your function is defined between $0$ and $2\pi$, with a couple of jump discontinuities. So you have the given $f(x)$ and its FS $S(x)$. Do you know what the Dirichlet conditions are? Look in your book for that. It will tell you something about when $f(x) = S(x)$ and when it doesn't. This problem does not involve calculating the FS.