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Line 37: Line 37:  
b_{21} & b_{22}  
 
b_{21} & b_{22}  
 
\end{bmatrix}  
 
\end{bmatrix}  
 +
\end{bmatrix} </math> =
 +
<math>\begin{bmatrix}
 +
a_{11}b_{11}  a_{11}b_{12} a_{12}b_{11}  a_{12}b_{12}\\
 
\end{bmatrix} </math>
 
\end{bmatrix} </math>
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