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%\psset{xunit=3.2, showpoints=false}
    \psset{xunit=6.4, yunit=9.6, showpoints=false}
    %\begin{pspicture}(-2,-1)(2,2)\psgrid
    \begin{pspicture}(0,1)(2,2)\psgrid
      %\psplot[linewidth=4\pslinewidth,linecolor=lightgray]{-2}{-1.8}{x dup dup mul 4 exch sub sqrt add 2 div}
      %\psplot[linewidth=4\pslinewidth,linecolor=lightgray]{-1.8}{1.8}{x dup dup mul 4 exch sub sqrt add 2 div}
      \psplot[linewidth=4\pslinewidth,linecolor=lightgray]{0}{1.8}{x dup dup mul 4 exch sub sqrt add 2 div}
      \psplot[linewidth=4\pslinewidth,linecolor=lightgray]{1.8}{2}{x dup dup mul 4 exch sub sqrt add 2 div}
      \newcommand{\InitCond}{1}
      \newcommand{\Func}{x mul 2 exch sub 4 x dup mul sub div}
      \psplotequadiff[linecolor=magenta, plotpoints=11]{0}{1.9}{\InitCond}{\Func}
      \psplotequadiff[linecolor=blue, plotpoints=101]{0}{1.9}{\InitCond}{\Func}
      \psplotequadiff[linecolor=red, method=rk4, plotpoints=11]{0}{1.9}{\InitCond}{\Func}
    \end{pspicture}

 

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