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[" (ii) If "omega" be "a" complex cube r...

[" (ii) If "omega" be "a" complex cube root of unity,prove that "],[(a+b omega+c omega^(2))^(3)+(a+b omega^(2)+c omega)^(3)=(2a-b-c)(2b-c-a)(2c-a-b)],[" and "quad =27abc," if "a+b+c=0]

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