Question Number 28817 by abdo imad last updated on 30/Jan/18
$${let}\:{give}\:{f}\left({x}\right)={e}^{{i}\alpha{x}} \:\:\mathrm{2}\pi\:{prriodic}\:{and}\:\alpha\:\in{R}−{Z} \\ $$$${developp}\:{f}\:{at}\:{fourier}\:{series}. \\ $$
let-give-f-x-e-i-x-2pi-prriodic-and-R-Z-developp-f-at-fourier-series-