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%
% tkz-euclide (14/01/2011)
%
% Coding (utf8) Creator (TeX) Producer (pdfeTeX) 
% Author Alain Matthes
\input{tkzfctpreamble.ltx}

\begin{document}

\begin{tikzpicture}
  \tkzInit[xmin=-7,xmax=7,ymin=-1,ymax=1]
  \tkzAxeY[gradsize=\scriptstyle]
  \tkzAxeX[trig=2]
  \foreach\v in {-2,-1,1,2}
  {\tkzVLine[color=red]{\v*\FPpi}}
\end{tikzpicture}

\end{document}