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a) Show that (p q)(p q) and q are logically equivalent by developing a series of logical equivalences (i.e. by using a symbolic derivation). b)

a) Show that (p q)(p q) and q are logically equivalent by developing a series of logical equivalences (i.e. by using a symbolic derivation). b) Show using a symbolic derivation that (p q) (p q) is a tautology.

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