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4. We saw in class that if A is an orthogonal matrix, then ||AX|| = ||X||. One matrix for which we know this is true is the r

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4. ca) - bine A= AT= A: - bino loe oe - bine AA - dino Busg- bing - bing %3D Co в |- bing AAT = AA = Ix2 Henre A isanoo thog

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