I was finally able to figure out how to find the sine series for cos(x), but only for [0,2pi]. A question i have though is what is the interval of validity? is it only [0,pi]?(adsbygoogle = window.adsbygoogle || []).push({});

Ie if I actually had to sketch the graph of the sum of the series, on all of R, would I have cosine or just a periodic extension of cosine from [0,2pi]?

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# Sine series for cos(x) (FOURIER SERIES)

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