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18. Let A be a 3x3 real nonsingular matrix such that A^-1 = A. Characterize...

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18. Let A be a 3x3 real nonsingular matrix such that A^-1 = A. Characterize its eigenvalues.1. -2, 1, or -12. 1 or 23. -1 or -24. 1 or -15. -1, 1, or 26. None of the above.

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