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Question Number 35580 by abdo mathsup 649 cc last updated on 20/May/18

if   (1/(1+cosx)) = (a_0 /2) +Σ_(n=1) ^∞  a_n  cos(nx)  calculate a_0   and a_n

$${if}\:\:\:\frac{\mathrm{1}}{\mathrm{1}+{cosx}}\:=\:\frac{{a}_{\mathrm{0}} }{\mathrm{2}}\:+\sum_{{n}=\mathrm{1}} ^{\infty} \:{a}_{{n}} \:{cos}\left({nx}\right)\:\:{calculate}\:{a}_{\mathrm{0}} \\ $$$${and}\:{a}_{{n}} \\ $$

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