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

% Ex. No. 74 (Section 16.1 : \tkzname{pgfmath})

\begin{tikzpicture}
  \def\Asmall{0.7 } \def\Abig{3 } \def\B{20}%Herbert Voss
  \path[fill=blue!40!black,domain=-pi:pi,samples=500,smooth,variable=\t]%
          plot({\Abig*cos(\t r)+\Asmall*cos(\B*\t r)},%
               {0.5*\Abig*sin(\t r)+0.5*\Asmall*sin(\B*\t r)});
  \def\Asmall{0.7 } \def\Abig{3 } \def\B{10}
  \path[shift={(1,1)},fill=blue!40!black,%
        domain=-pi:pi,samples=500,smooth,variable=\t]%
        plot({\Abig*cos(\t r)+\Asmall*cos(\B*\t r)},%
             {0.5*\Abig*sin(\t r)+0.5*\Asmall*sin(\B*\t r)});
\end{tikzpicture}

\end{document}