(square roots of the identity matrir) For how many 2 x 2 matrices A is it...

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(square roots of the identity matrir) For how many 2 x 2 matrices A is it true that A? = 1? Now answer the same question for n x n matrices where n> 2. 1. (square roots of the identity matrir) For how many 2 x 2 matrices A is it true that A? = 1? Now answer the same question for n x n matrices where n> 2. 1.