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3. Decide if the following statements about 3 x 3 matrices are true or false. If true, prove it. If false, give a counterexample. (a)

3. Decide if the following statements about 3 x 3 matrices are true or false. If true, prove it. If false, give a counterexample. (a) If AB = BA then (A + B)2 = A2 + 2AB + B2. (b) If (A + B)2 = A2 + 2A3 + B2, then AB = BA

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