Find the adjoint of the matrices: \[ A=\left[\begin{array}{ll} 1 & 2 \\ 3 & 4 \end{array}\right]...
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0Find the adjoint of the matrices:
\[
A=\left[\begin{array}{ll}
1 & 2 \\
3 & 4
\end{array}\right]
\]
Also verify that \( \mathrm{A}(\operatorname{adj} \mathrm{A})=|\mathrm{A}| \mathrm{I}_{2}=(\operatorname{adj} \mathrm{A}) \mathrm{A} \).
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