\documentclass[crop,varwidth=10cm]{standalone}

%\usepackage{geometry}
\usepackage[dutch]{babel}
\usepackage{parskip}
\usepackage{amsmath,amssymb}

% \geometry{
% 	paperwidth=9cm,
% 	paperheight=7.5cm,
% 	margin=0.0cm,
% 	paperheight=3cm,
% 	paperheight=2cm,
%     %paperwidth=4cm,
%     paperheight=2cm
% }

\begin{document}
    \centering
    $ \begin{pmatrix}
        \cos(\theta) & -\sin(\theta)\\
        \sin(\theta) & \cos(\theta)
    \end{pmatrix}\quad 
    \begin{bmatrix}
        \cos(\theta) & -\sin(\theta)\\
        \sin(\theta) & \cos(\theta)
    \end{bmatrix}\quad
    \begin{Bmatrix}
        \cos(\theta) & -\sin(\theta)\\
        \sin(\theta) & \cos(\theta)
    \end{Bmatrix} $

    \vspace{5pt}
    $
    \begin{vmatrix}
        \cos(\theta) & -\sin(\theta)\\
        \sin(\theta) & \cos(\theta)
    \end{vmatrix}\quad
    \begin{Vmatrix}
        \cos(\theta) & -\sin(\theta)\\
        \sin(\theta) & \cos(\theta)
    \end{Vmatrix}\quad
    \begin{matrix}
        \cos(\theta) & -\sin(\theta)\\
        \sin(\theta) & \cos(\theta)
    \end{matrix}
    $

    % \begin{align*}
        
    % \end{align*}
\end{document}