8.1.15 Polar



  \begin{texgraph}[name=Polaire,export=pgf]
  view(-3,2,-2,3),Marges(0.25,0.25,0.25,0.25),
  size(7.5),Width:=4,
  Axes(0,1+i),NbPoints:=250,tMin:=-25,tMax:=25,
  courbe:=Get(Polaire((t+1)/(t-1))),
  ptDoubles:= courbe InterL courbe,
  Width:=8, Color:= blue, Ligne(courbe,0),
  DotStyle:=dotcircle, DotScale:=2,
  Point(ptDoubles),
  Label(1+2*i,"$r(t)=\dfrac{t+1}{t-1}$")
  \end{texgraph}

 PIC



Polar curve and double point