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Let Q = ( 41 | 42 | m] e Rmxm be an orthogonal matrix. Which of the following are true statements? (Choose all true

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Let Q = ( 41 | 42 | m] e Rmxm be an orthogonal matrix. Which of the following are true statements? (Choose all true statement.) 1. The column vectors 91, 92, ..., Am of Q are linearly independent. 2. QQT = 1 3. Q2||2 = ||2||2 for any z ERM 4. Q is a symmetric matrix. 1 N 3 4

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