8.1.10 Implicit



  \begin{texgraph}[name=Implicit,export=pgf]
  view(-5,5,-5,5),Marges(0,0,0,0),
  size(7.5), Arrows:=1, Width:=4,
  Axes(0,1+i), Arrows:=0,
  Width:=8, Color:=red,
  Implicit( sin(x*y) )
  \end{texgraph}

 PIC



sin(xy) = 0 equation