Problem:
Compute the trace of
$\left(
\begin{array}{ccc}
 \frac{8}{\sqrt{\pi }} & -\frac{4}{\sqrt{\pi }} & -\frac{17}{\sqrt{\pi }} \\
 \frac{12}{\sqrt{\pi }} & \frac{10}{\sqrt{\pi }} & \frac{14}{\sqrt{\pi }} \\
 -\frac{17}{\sqrt{\pi }} & -\frac{3}{\sqrt{\pi }} & -\frac{14}{\sqrt{\pi }} \\
\end{array}
\right)$.
Answer:
$\frac{4}{\sqrt{\pi }}$
{'source': 'AMPS', 'file': 'amps/mathematica/linear_algebra/trace/41806.txt'}