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Question Number 34682 by math khazana by abdo last updated on 09/May/18

calculate Σ_(n=0) ^∞ ln(cos((a/2^n )))

$${calculate}\:\:\sum_{{n}=\mathrm{0}} ^{\infty} \:\:{ln}\left({cos}\left(\frac{{a}}{\mathrm{2}^{{n}} }\right)\right) \\ $$

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