(%i2) A : matrix([ - 1, - 7, - 3],[ 2, 15, 6],[ 1, 3, 2]) ;
adjoint( A) ;
(A) [ 1 7 3 2 15 6 1 3 2 ] (%o2) [ 12 5 3 2 1 0 9 4 1 ]
(%i3) mat_trace( %o2) ;
0 errores, 0 advertencias (%o3) 12

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