\( \textbf{A}_{2 \times2} = \)
\( \textbf{A}_{2 \times 2} = \)
\( \textbf{A}^{-1} = \)
\( \textbf{A}_{2 \times 2} = \)
\( \textbf{B}_{2 \times 2} = \)