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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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