Question
If $A=\left[\begin{array}{cc}0 & 1 \\ 2 & 3 \\ 1 & -1\end{array}\right]$ and $B=\left[\begin{array}{lll}1 & 2 & 1 \\ 2 & 1 & 0\end{array}\right]$, then find $(A B)^{-1}$
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$x=\sqrt{a^2+m^2}, y=\log \left(a^2+m^2\right)$
| $x_i$ | -1 | 0 | 1 | 2 | 3 |
| $p_i$ | 0.3 | 0.1 | 0.1 | 0.3 | 0.2 |