Problem:
Compute the trace of
$\left(
\begin{array}{ccccc}
 \pi  & 2 \pi  & 2 \pi  & -3 \pi  & 3 \pi  \\
 0 & 2 \pi  & -\pi  & 3 \pi  & 0 \\
 \pi  & 0 & \pi  & 2 \pi  & \pi  \\
 -\pi  & 0 & -3 \pi  & 3 \pi  & 3 \pi  \\
 2 \pi  & 0 & 3 \pi  & -2 \pi  & -2 \pi  \\
\end{array}
\right)$.
Answer:
$5 \pi$
{'source': 'AMPS', 'file': 'amps/mathematica/linear_algebra/trace/28501.txt'}