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\input{preamble-standalone.ltx}
\begin{document}

% Ex. No. 54 (Section 12.2 : Équation polaire exemple 2)

\begin{tikzpicture}[scale=1.25]
   \tkzInit [xmin=-1,xmax=1,
             ymin=-1,ymax=1,
             xstep=.2,ystep=.2]
  \tkzDrawX   \tkzDrawY
  \tkzFctPolar[domain=0:2*pi]{cos(2*t)}
\end{tikzpicture}

\end{document}