α+β

uv

O = Intersect(xAxis, yAxis)
A = (2.12, 1.62)
B = (-1.12, 3.64)
u = Vector(O, A)
v = Vector(O, B)
D = Point(xAxis)
α = Angle(D, O, A)
β = Angle(D, O, B)
B' = Rotate(B, α, O)
w = Vector(O, B')
γ = Angle(D, O, B')
a = Ray(O, B')
c = Circle(O, A)
E = Intersect(c, xAxis, 2)
F = Point(xAxis)
z = Vector(O, F)
b = Vector(O, E)
G = Intersect(c, a, 1)
d = Segment(B', F)
e = Line(E, d)
P = Intersect(a, e)
f = Vector(O, P)