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\psset{unit=4}
\begin{pspicture}(-1,0)(3,2)\psgrid
  \psplot[linewidth=4\pslinewidth,linecolor=gray]{-1}{3}{2.71828182846 x dup mul neg exp}
  \psset{plotpoints=9}
  \psplotequadiff[linecolor=cyan]{-1}{3}{1 2.71828182846 div}{x -2 mul mul}
  \psplotequadiff[linecolor=yellow, method=RK4]{-1}{3}{1 2.71828182846 div}{x -2 mul mul}
  \psset{plotpoints=21}
  \psplotequadiff[linecolor=blue]{-1}{3}{1 2.71828182846 div}{x -2 mul mul}
  \psplotequadiff[linecolor=Orange, method=RK4]{-1}{3}{1 2.71828182846 div}{x -2 mul mul}
  \psset{linewidth=2\pslinewidth}
  \rput*(2,1.7){\psline[linecolor=Orange](-1,0)}
  \rput*[l](2,1.7){RK}
  \rput*(2,1.8){\psline[linecolor=blue](-1,0)}
  \rput*[l](2,1.8){\textsc{Euler}-1}
  \rput*(2,1.9){\psline[linecolor=gray](-1,0)}
  \rput*[l](2,1.9){solution}
\end{pspicture}

 

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