[Latex] Matrix and Determinant

1. Matrix

\begin{equation}
  \left(
    \begin{array}{ccc}
    a&b&c\\
    d&e&f\\
    g&h&i
    \end{array}
  \right)
\end{equation}

result

2. Determinant

\begin{equation}
  \left|
    \begin{array}{ccc}
    a&b&c\\
    d&e&f\\
    g&h&i
    \end{array}
  \right|
\end{equation}