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prove-that-pi-pi-cos-2x-cos-3x-cos-4x-cos-2005x-dx-gt-0-

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Question Number 77729 by aliesam last updated on 09/Jan/20
prove that ∫_(−π) ^π cos(2x) cos(3x) cos(4x)....cos(2005x)dx>0
provethat∫−ππcos(2x)cos(3x)cos(4x)….cos(2005x)dx>0

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