4. Verify the following identities by applying a chain of logical identities. You may use only those identifies in the "basic logical identities" table. Make sure you cite every law used, no matter how obvious the law might be. (a) ¬(p → ¬q) = p^q (b) p^ ((q v¬p) Vr) = p ^ (q vr) (c) (q^¬p) v (p^¬q) = ¬(pq) (d) (p^q) →q=T

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