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The value of (a+bomega+comega^2)/(b+come...

The value of `(a+bomega+comega^2)/(b+comega+aomega^2)+(a+bomega+comega^2)/(c+aomega+bomega^2)` (where `'omega'` is the imaginary cube root of unity), is (a) `-omega` (b). `omega^2` (c). `1` (d). `-1`

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