Fourier series: The Fourier series of an arbitrary function
Practice with determining a Fourier cosine series
Consider the periodic continuation of \[f(x)=|\cos(x)|\qquad \text{voor }x\in(-\tfrac{1}{2}\!\pi,\tfrac{1}{2}\!\pi)\] Determine the first three cosine terms of the corresponding Fourier cosine series.
\(|\cos(x)|\approx {}\) |
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