Dear Gurpreet,

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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