https://www.geogebra.org/haftendorn
Haftendorn, Buch (Springer):
Kurven erkunden und verstehen
Kap 4.4.2.1: S. 116

Ha 2016

a = 4
c: x^(2) = a^(2) + ((2 * a) * y)
d: x^(2) = a^(2) - ((2 * a) * y)
Q = Point(d)
b = Line(Q, xAxis)
E', E = Intersect(c, b)
Q' = Mirror(Q, yAxis)
P = Midpoint(Q, E)
P_w = Midpoint(Q', E)
P'_w = Mirror(P_w, yAxis)
P' = Mirror(P, yAxis)
Ortslinie1 = Locus(P, Q)
Ortslinie2 = Locus(P', Q)
e: x^(4) = (a^(2) * (x^(2) - y^(2)))
f = false