como calculae a soma diagonal principal matriz 3x3?
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Sea la matriz
![\left[\begin{matrix}
a_{11}&a_{12}&a_{13}\\
a_{21}&a_{22}&a_{23}\\
a_{31}&a_{32}&a_{33}
\end{matrix}\right]](https://tex.z-dn.net/?f=%5Cleft%5B%5Cbegin%7Bmatrix%7D%0Aa_%7B11%7D%26amp%3Ba_%7B12%7D%26amp%3Ba_%7B13%7D%5C%5C%0Aa_%7B21%7D%26amp%3Ba_%7B22%7D%26amp%3Ba_%7B23%7D%5C%5C%0Aa_%7B31%7D%26amp%3Ba_%7B32%7D%26amp%3Ba_%7B33%7D%0A%5Cend%7Bmatrix%7D%5Cright%5D "\left[\begin{matrix}
a_{11}&a_{12}&a_{13}\\
a_{21}&a_{22}&a_{23}\\
a_{31}&a_{32}&a_{33}
\end{matrix}\right]")
Entonces la suma de elementos de la diagonal principal es
Entonces la suma de elementos de la diagonal principal es
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