https://www.geogebra.org/haftendorn
Haftendorn, Buch (Springer):
Kurven erkunden und verstehen
Kap 9.5.5  S.295 Afg. 9.13
www.kurven-erkunden-und-verstehen.de

Ha 2017

k = 1
p = 0.7
ε = 1.4 (slider from -5 to 5, step 0.1)
r(x) = p / (1 - (ε * cos(x)))
a = CurveCartesian((r(t) * cos(t)), (r(t) * sin(t)), t, 0, (2 * π))
c: x^(2) + y^(2) = k^(2)
a' = Mirror(a, c)
b = false