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= ( ³√5 -1)³ + 3(³√5 -1)² + 3(³√5 -1)
= 5 - 3 ³√5 - 1 + 3(³√5)(³√5) - 2 ³√5 +1) + ³√5 - 1
= 5+1-1-1
= 4