A = Intersect(xAxis, yAxis)
B = Point(yAxis)
c = Circle(A, B)
C = Point(c)
D = Intersect(c, xAxis, 2.0)
a = Segment(A, C)
α = Angle(D, A, C)
M: (α, y(C))
f(x) = sin(x)
sinus: y(C)