Drawing a double headed LaTeX arrow

I hope this helps:

\documentclass{beamer}
\beamertemplatenavigationsymbolsempty
\usepackage{tikz}
\usetikzlibrary{arrows, arrows.meta}
\begin{document}
\begin{frame}[fragile,t]
\frametitle{}
\begin{tikzpicture}[scale=.9, transform shape]
\draw[>=triangle 45, <->] (0,0) -- (2,0);
\end{tikzpicture}
\end{frame}
\end{document}

which shall give you

Extra

You could choose to play probably play with \draw[>=style options, <->, color options] (0,0) -- (2,0);

To provide a complete answer :

You can use the latex'-latex' style definition.

More documentation is available on arrows definition at section 16.2 page 182 of the pgf manual.