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[" If "w=cos(pi)/(n)+i sin(pi)/(n)," the...

[" If "w=cos(pi)/(n)+i sin(pi)/(n)," then the value of "],[1+w+w^(2)+...+w^(n-1)is],[" O "1+i cot((pi)/(n))],[" O "1+i tan((pi)/(2n))]

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