Problem:
Compute the trace of
$\left(
\begin{array}{ccc}
 4 & 6 & -2 \\
 0 & 3 & 0 \\
 -6 & 0 & -1 \\
\end{array}
\right)$.
Answer:
$6$
{'source': 'AMPS', 'file': 'amps/mathematica/linear_algebra/trace/43482.txt'}