I am confused on how to approach the Fourier series of a piecewise function. Here's an example of such a function:

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Here is the function: $$ f(x) = \begin{cases} 0, & 0 < x < 1, \\ 1, & 1 < x < 2, \\ 0, & 2 < x < 3. \end{cases} $$

Can someone help explain this to me?