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Question Number 99241 by abdomathmax last updated on 19/Jun/20
$$\mathrm{let}\:\mathrm{g}\left(\mathrm{x}\right)=\sqrt{\mathrm{1}−\mathrm{cosx}}\:\mathrm{developp}\:\mathrm{g}\:\mathrm{at}\:\mathrm{fourier}\:\mathrm{serie} \\ $$