B = Point(yAxis)
F = Point(xAxis)
F' = Mirror(F, yAxis)
c = Ellipse(F, F', B)
S: (1.5, 0)
f = Line(S, xAxis)
β = 0 rad (slider from 0 to 357°, step 3°)
f' = Rotate(f, β, S)
C, D = Intersect(c, f')
g = Tangent(D, c)
f'' = Mirror(f', g)
E = Intersect(c, f'', 2)
r2 = Segment(D, E)
r1 = Segment(S, D)