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I am just a beginner in Fourier series.How should I get start to tackle this question and show the partial sum has extrema? I have no clue to this question. Any help would be highly appreciated.

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I forgot to upload the function and here it is.

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If square waves are square integrable, why doesn't fourier expanding work?

The answer on this question is very similar, the overshoot is twice that! I had the same question and someone answered me. Hope this helps

user2543
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