 
with h(t) =
√((sin(t)b)^{2}+cos^{2}(t)) This is the conchoid
of a circle, given a unity
circle and a fixed point O(0, b) and a conchoid constant a.
When the constant a is equal to the radius of the circle (i.e. 1), five
situations can be distinguished for the kind of curve:
 0 < b < 1: one large eggform and two small ones
 b = 1: trisectrix
 1 < b < 2: three parts
 b = 2: two parts
 b > 2: two parts and one singularity
