a=![\left[\begin{array}{ccc}-2\\4\\5\end{array}\right]](https://tex.z-dn.net/?f=%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D-2%5C%5C4%5C%5C5%5Cend%7Barray%7D%5Cright%5D "\left[\begin{array}{ccc}-2\\4\\5\end{array}\right]")
b=![\left[\begin{array}{ccc}1&3&-6\\\end{array}\right]](https://tex.z-dn.net/?f=%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D1%26amp%3B3%26amp%3B-6%5C%5C%5Cend%7Barray%7D%5Cright%5D "\left[\begin{array}{ccc}1&3&-6\\\end{array}\right]")
find (ab)
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