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Here is a definition to be used soon: X and Y are logically equivalent if and only if the argument from X to Y is logically valid and the argument from Y (back) to X is also logically valid. 1. For each of the following two claims of logical equivalence, establish it by (i) constructing a truth table and (ii) marking all the cases/rows in which both sentences are true: â– De Morganâ€™s Law 1 (10%) ~(A&B) is logically equivalent to (~A)v(~B); â– De Morganâ€™s Law 2 (10%) ~(AvB) is logically equivalent to (~A)&(~B).