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Determine if the following expression is a tautology, a contradiction, or a contingency by using the logical equivalences. You may not use a truth table.
Determine if the following expression is a tautology, a contradiction, or a contingency by using the logical equivalences. You may not use a truth table. Show all your work, labelling each rule used, and do not skip any steps. (4 marks) a. ( ( )) (( ) )
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