M(z=e^{i\theta})

S(Z=1+z+z^2)

θ = -5.283185307179586 (slider from -6.283185307179586 to 6.28318531, step 0.1)
z: exp(ί * θ)
Z: 1 + z + z^(2)
O = (0, 0)
c = Circle(O, 1)
I = (1, 0)