\( \DeclareMathOperator{\abs}{abs} \newcommand{\ensuremath}[1]{\mbox{$#1$}} \)
| (%i2) |
A
:
matrix([
-
1,
-
7,
-
3],[
2,
15,
6],[
1,
3,
2])
;
adjoint( A) ; |
| (%i3) | mat_trace( %o2) ; |
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