Problem:
Compute the (pseudo)inverse of
$\left(
\begin{array}{cc}
 -\frac{1}{3} & -3 \\
 1 & -\frac{4}{3} \\
\end{array}
\right)$.
Answer:
$\left(
\begin{array}{cc}
 -\frac{12}{31} & \frac{27}{31} \\
 -\frac{9}{31} & -\frac{3}{31} \\
\end{array}
\right)$
{'source': 'AMPS', 'file': 'amps/mathematica/linear_algebra/pseudoinverse/48559.txt'}