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## Fourier coefficients : fourier_an and fourier_bn or fourier_cn

Let f be a T-periodic continuous functions on except maybe at a finite number of points. One can prove that if f is continuous at x, then;
 f (x) = + ancos() + bnsin() = cne2inxT

where the coefficients anbn, n N, (or cn, n Z) are the Fourier coefficients of f. The commandsfourier_an and fourier_bn or fourier_cn compute these coefficients.

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giac documentation written by Renée De Graeve and Bernard Parisse