If \( A=\left[\begin{array}{ll}x & 1 \\ 1 & 0\end{array}\right] \) and \( \mathrm{A}^{2} \) is t...
If \( A=\left[\begin{array}{ll}x & 1 \\ 1 & 0\end{array}\right] \) and \( \mathrm{A}^{2} \) is the identity matrix, then \( x= \)
(a) 1
(b) 2
(c) 3
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