\begin{frame}[fragile]{Wiskunde}
Er zijn twee manieren om wiskunde te zetten:

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    The trigonometric identity is given by $ \sin^2(\theta) + \cos^2(\theta) = 1 $ for all $ \theta $.
\end{tcolorbox}

 \begin{tcolorbox}[width=11cm, title={display mode}, size=small]
    The Pythagorean trigonometric identity is given by
    \begin{equation} \sin^2(\theta) + \cos^2(\theta) = 1. \end{equation}
    The identity
    \begin{equation} 1 + tan^2(\theta) = \frac{1}{cos^2\theta}\end{equation}
    is also called the Pythagorean trigonometric identity.

\end{tcolorbox}

% {\small Er is maar 1 manier om wiskunde te zetten in inline mode.
% Maar er zijn vele \textbf{environments} om wiskunde te zetten in display mode.}
\end{frame}