If ω ≠ 1 is a cube root of unity, then 11+i+ω2ω21−i−1ω2−1−i−i+ω−1−1 equal

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answer is A.

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Detailed Solution

Use R2→R2−R1−R3, then the first row of the determinant elements are all zero's, hence the determinant value=0

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