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" 32."sum(0<=i<1<=n)(^(n)C(i)+^(n)C(j))^...

" 32."sum_(0<=i<1<=n)(^(n)C_(i)+^(n)C_(j))^(2)" is equal to "

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sum_(m=1)^(32)m[sum_(k=1)^(6)sin2k(pi)/(7)-i cos2k(pi)/(7)]