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certificate-k-0-n-csc-x-2-k-cot-x-2-n-1-cot-x-

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Question Number 212809 by MrGaster last updated on 24/Oct/24
certificate: Σ_(k=0) ^n csc(x/2^k )=cot(x/2^(n+1) )−cot x
certificate:∑nk=0cscx2k=cotx2n+1−cotx

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