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\documentclass{article}
\usepackage[dutch,english]{babel} % load babel before spel to avoid
% option clash!
\selectlanguage{english}
\usepackage[format=ogg]{spelatex}
\newrobustcmd\CTAN{CTAN}
\spelmacad{CTAN}{see-tan}
\newrobustcmd\CPAN{CPAN}
\spelmacad{CPAN}{see-pan}
\title{\spelatex{} Example}
\author{Walter Daems and Paul Levrie}
\date{2011/04/12}
\setlength\parindent{0em}
\setlength\parskip{1ex}
\begin{document}
\maketitle
\section{Introduction}
\begin{spelchunk}
This file is just a simple showcase of the features of \spelatex.
Below, you'll find examples of:
\end{spelchunk}
\begin{itemize}
\spelitem{a simple equation}
\spelitem{a more complex equation}
\end{itemize}
\section{A simple equation}
\label{eqn:simple}
\begin{spelchunk}
Consider the following simple definition of a polynomial function and
check its spoken version by clicking on it.
\end{spelchunk}
\begin{spelchunk}
\begin{equation}
f(x) = x^{5}- x^4 + 7 x^3 + 3 x^2 - 8 x + 23
\end{equation}
\end{spelchunk}
\begin{spelchunk}
This seems a simple equation, however, it is not so straightforward
for an automated reader, to read it correctly.
\end{spelchunk}
\section{A more complex equation}
\newcommand\xx[2]{\ensuremath{#1_{#2}}}
\spelmacad{xx}[2]{#1 #2}
\label{eqn:complex}
\begin{spelchunk}
For a lightray that hits the parabola at the point
$P(t,9-\frac{t^2}{4})$, the reflected ray has slope $\tan 2\alpha$.
Since the slope of the tangent to the parabola at $P$ is
equal to $\tan\alpha = -\frac{t}{2}$, the equation of the
reflected ray is given by
\end{spelchunk}
\begin{spelchunk}
\[
y-9+\frac{t^2}{4} = -\frac{4t}{4-t^2} \cdot (x-t)
\]
\end{spelchunk}
\selectlanguage{dutch}
\section{Een andere taal}
\begin{spelchunk}
\spelatex{} is ook volledig babel-actief, wat wil zeggen dat de
voorleesstem de geselecteerde taal zal volgen.
\end{spelchunk}
\begin{spelchunk}
\[
y-9+\frac{t^2}{4} = -(x-t) \cdot \frac{4t}{4-t^2}
\]
\end{spelchunk}
\selectlanguage{english}
\section{And some extras}
\subsection{Citations}
\begin{spelchunk}
Two excellent repositories are \CPAN{} \cite{CPAN} and \CTAN{} \cite{CTAN}.
\end{spelchunk}
\subsection{References to labels}
\begin{spelchunk}
Section~\ref{eqn:simple} contains an illustration of a simple
equation. For a more complex equation, we refer the user to
section~\ref{eqn:complex}.
\end{spelchunk}
\bibliographystyle{alpha}
\begin{thebibliography}{99}
\bibitem{CTAN}
The Comprehensive \TeX{} Archive Network.
\newblock \url{http://www.ctan.org}.
\newblock online, accessed in August 2021.
\bibitem{CPAN}
The Comprehensive Perl Archive Network.
\newblock \url{http://www.cpan.org}.
\newblock online, accessed in August 2021.
\end{thebibliography}{99}
\end{document}
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