Find 
if ![A =\left[\begin{array}{ccc}1&2\\-1&3\end{array}\right]](https://tex.z-dn.net/?f=A+%3D%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D1%26amp%3B2%5C%5C-1%26amp%3B3%5Cend%7Barray%7D%5Cright%5D "A =\left[\begin{array}{ccc}1&2\\-1&3\end{array}\right]")
, ![B =\left[\begin{array}{ccc}4&-5\\6&-2\end{array}\right]](https://tex.z-dn.net/?f=B+%3D%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D4%26amp%3B-5%5C%5C6%26amp%3B-2%5Cend%7Barray%7D%5Cright%5D "B =\left[\begin{array}{ccc}4&-5\\6&-2\end{array}\right]")
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