For each of the following claims of logical equivalence, establish it by )i) constructing a truth table and (ii) marking all the cases in which both sentences are true:

1. For each of the following claims of logical equivalence, establish it by (i) constructing a truth table and (ii) marking all the cases in which botlh sentences are true: De Morgan's Law 1 (10%) (A&B) is logically equivalent to (-AX-B); De Morgan's Law 2 (10%) (AvB) is logically equivalent to (~A)&(~B)