Am I crazy or this is impossible to do if we require that the period of the extended even function be 2pi ?(adsbygoogle = window.adsbygoogle || []).push({});

Yet, this question comes in my textbook before the section concerning Fourier extension of functions of period other than 2pi. So there must be a way?

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# Developping sin(x) on [0, pi] as a serie of cosines

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