Koordinatenachsenbeschriftung unterdrücken

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\documentclass{article}
\pagestyle{empty}% for cropping
\usepackage{mathtools,pgfplots}
\begin{document}
\begin{center}
\begin{tikzpicture}[thick,scale=0.55, every node/.style={scale=1.2}]
\begin{axis}[
    no markers,
    samples=199,
    smooth,
    domain=-0.4:0.4,
    axis lines=middle,
    width=\linewidth
   % enlarge y limits=0.1
]
    \pgfplotsinvokeforeach{1,2,3}{
        \xdef\sn{}
        \foreach \m in {1,...,#1} {
            \xdef\sn{\sn+2*cos(deg((2*\m)*pi*x))}
        }
        \expandafter\addplot\expandafter{\sn};
    }
    \begin{scope}[
            every node/.style = {draw,fill=blue,circle,inner sep=1pt}
        ]
    \end{scope}
\end{axis}
 \end{tikzpicture}
 \end{center}
 \end{document}
 
 
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