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if-1-1-cosx-a-0-2-n-1-a-n-cos-nx-calculate-a-0-and-a-n-




Question Number 33258 by prof Abdo imad last updated on 14/Apr/18
if   (1/(1+cosx)) = (a_0 /2) +Σ_(n≥1) a_n cos(nx) calculate a_0   and a_n
$${if}\:\:\:\frac{\mathrm{1}}{\mathrm{1}+{cosx}}\:=\:\frac{{a}_{\mathrm{0}} }{\mathrm{2}}\:+\sum_{{n}\geqslant\mathrm{1}} {a}_{{n}} {cos}\left({nx}\right)\:{calculate}\:{a}_{\mathrm{0}} \\ $$$${and}\:{a}_{{n}} \\ $$

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