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    Invertible Matrices

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    Find all invertible matrices A of the form A =[a b]
    [c d]
    and satisfying A = A−1 and A^T = A^−1. Hint: The identity cos^2 t + sin^2 t = 1 may be useful.

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    https://brainmass.com/math/matrices/invertible-matrices-146696

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    Invertible matrices are investigated.

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