Matrices

$$ \begin{matrix} a &b \\ c &d \end{matrix} $$
$$
\begin{matrix}
 a &b \\
 c &d
\end{matrix}
$$
$$ \begin{pmatrix} a &b \\ c &d \end{pmatrix} $$
$$
\begin{pmatrix}
 a &b \\
 c &d
\end{pmatrix}
$$
$$ \begin{bmatrix} a &b \\ c &d \end{bmatrix} $$
$$
\begin{bmatrix}
 a &b \\
 c &d
\end{bmatrix}
$$
$$ \begin{vmatrix} a &b \\ c &d \end{vmatrix} $$
$$
\begin{vmatrix}
 a &b \\
 c &d
\end{vmatrix}
$$
$$ \begin{Vmatrix} a &b \\ c &d \end{Vmatrix} $$
$$
\begin{Vmatrix}
 a &b \\
 c &d
\end{Vmatrix}
$$

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