w = (-1 + sqrt.3 i)/2 or w = (-1 - sqrt.3 i)/2
i2 = -1
so, w = i (i + sqrt.3 )/2 and w = i (i - sqrt.3 )/2
put value of w = (i + sqrt.3 ) and w = (i - sqrt.3 ) in given quest. and use w3 = 1 and i2 = -1 to solve the problem.
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