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If 1,alpha1,alpha2, ,alpha(n-1) are the...

If `1,alpha_1,alpha_2, ,alpha_(n-1)` are the `n t h` roots of unity, prove that `(1-alpha_1)(1-alpha_2)(1-alpha_(n-1))=ndot` Deduce that `sinpi/nsin(2pi)/n sin((n-1)pi)/n=sinn/(2^(n-1))`

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