If both matrices A,B are orthogonal prove that (ab) is also orthogonal

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A: As you have mentioned I am answering number 4

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A: # As per the guidelines we are entitled to solve one question at a time please resubmit the other…

Q: 19. 2x + 2y + 4z = 0 w - y - 3z = 0 2w + 3x + y + z = 0 -2w + x + 3y - 2z = 0

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A: “Since you have asked multiple question, we will solve the first question for you. If youwant any…