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4.tex
\documentclass[10pt,a4paper]{article}
\begin{document}
\section*{}
List of mathematical functions:
\begin{itemize}
\item Trigonometric functions
\begin{itemize}
\item[-] sine
\item[-] cosine
\item[-] tangent
\end{itemize}
\item Special functions
\begin{itemize}
\item[-] Beta functions
\item[-] Gamma functions
\item[-] Riemann zeta functions
\end{itemize}
\end{itemize}
\end{document}