f = 2.6 (slider from 0 to 5, step 0.1)
A: -((f, 0.0))
B: (f, 0.0)
a = 4.4 (slider from -5 to 5, step 0.1)
c = Ellipse(A, B, a)
d = Hyperbola(A, B, a - f)