Tangensfunktion zeichnen

A = Point(xAxis)
c = Circle(A, 1.0)
B = Point(c)
b = Line(A, B)
C = Intersect(a, b)
D = (1, 0)
α = Angle(D, A, B)
d = Segment(D, C)
E: (α, y(C))
Text1: "tan (" + α + ") = " + (y(C))
e = true