Bewege e mit 
den Pfeiltasten

https://www.geogebra.org/haftendorn
Haftendorn, Buch (Springer):
Kurven erkunden und verstehen
Kap 7.2.3: S.191
www.kurven-erkunden-und-verstehen.de

Ha 2016

f = 0.89
a = 2
e = 1.4 (slider from 0 to 8, step 0.1)
r(x) = (a^(2) - e^(2)) / (a - (e * cos(x)))
b = CurveCartesian((r(t) * cos(t)), (r(t) * sin(t)), t, 0, (2 * π))
d: ((10 - x) * ((f * y))^(2)) = ((x + 2) * (x - 4)^(2))
A, B = Intersect(d, yAxis)
c: 1 / f
g: x^(2) + y^(2) = (4 * a^(2))
h: (x - e)^(2) / a^(2) + y^(2) / (a^(2) - e^(2)) = 1
i = false