1 1 3. If A is a square matrix such that A3 = I, which one of the following must always be true? mark A: A=I B: AP= I C: AT = A D: A-1 = A2 E: A is a zero matrix

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1 1 3. If A is a square matrix such that A3 = I, which one of the following must always be true? mark A: A=I B: AP= I C: AT = A D: A-1 = A2 E: A is a zero matrix

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