https://www.geogebra.org/haftendorn
Haftendorn, Buch (Springer):
Kurven erkunden und verstehen
Kap 5.2.2  S. 144
www.kurven-erkunden-und-verstehen.de

Ha 2017

b = 1
a = -4 (slider from -5 to 5, step 1)
d: y = b
M: (0, ((-a)) / 2)
e = Circle(M, abs(a) / 2)
Q = Point(e)
O = (0, 0)
f = Line(O, Q)
E = Intersect(d, f)
u = Vector(Q, E)
P = Translate(O, u)
v = Vector(O, P)
Cissoide = Locus(P, Q)
sluze: ((y - b) * (x^(2) + y^(2))) = (a * y^(2))
c = false