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[AU(AUC)]U[(BU(AΠC] : Ley de idempontencia
[AUC]U[BUVvacío] : Ley de identidad
AUCUB : Commutativa
AUBUC Respuesta.
[A∪(∅)]∪[B∪(∅)]
[A]∪[B]
A∪B