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If omegane1 is a cube root of unity, sho...

If `omegane1` is a cube root of unity, show that the roots of the equation `(z-1)^(3)+8=0` are `-1,1-2omega,1-2omega^(2)`.

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The correct Answer is:
`1-2omega` and `1-2omega^(2)` are also roots of `(1)`
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