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If 1,z1,z2,z3,.......,z(n-1) be the n, ...

If `1,z_1,z_2,z_3,.......,z_(n-1)` be the n, nth roots of unity and `omega` be a non-real complex cube root of unity, then `prod _(r=1)^(n-1) (omega-z_r)` can be equal to

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