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We know A³= AxAxA (AC)(AC)(AC)=(AC)³ if A and C are commute then (AC)³=A³c³ (AC)³= (AC)(AC)(AC) =(AC)(AC)(CA)=(AC)(AC²A)=(AC)(AAC²) =(AC)(A²C²)=(CA)(A²c²)=CA³C²=A³C.C²=A³C³