If \( A=\left[\begin{array}{rr}3 & -4 \\ -1 & 2\end{array}\right] \), find matrix \( B \) such t...

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If \( A=\left[\begin{array}{rr}3 & -4 \\ -1 & 2\end{array}\right] \), find matrix \( B \) such that \( B A=I \).
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