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let-f-x-1-cosx-2sinx-developp-f-at-fourier-serie-

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Question Number 135370 by Bird last updated on 12/Mar/21
let f(x)=(1/(cosx +2sinx)) developp f at fourier serie
$${let}\:{f}\left({x}\right)=\frac{\mathrm{1}}{{cosx}\:+\mathrm{2}{sinx}} \\ $$$${developp}\:{f}\:{at}\:{fourier}\:{serie} \\ $$

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