$A=\left[\begin{array}{rr} 8 & 7
\\ -6 & -2 \end{array}\right] $ and
$B=\left[\begin{array}{rr} -\dfrac{1}{13} & -\dfrac{7}{26}
\\\\ \dfrac{3}{13} & \dfrac{4}{13} \end{array}\right]$
**Are $A$ and $B$ inverses?**
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