Question: Proofs by Discrete Structures (10 points each) Prove that (A-B)(A B)=A Let h:Z Z be define by h(n)= n^3-n . Prove or disprove that h

Proofs by Discrete Structures (10 points each) Prove that (A-B)(A B)=A Let h:Z Z be define by h(n)= n^3-n . Prove or disprove that h is injective

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