f(x) = (x + 1) / x
g(x) = x - 1 / x
A = Intersect(f, g, (-0.9999999999864129, -1.35871314201522E-11))
B = Intersect(f, g, (2.000000000021176, 1.499999999994706))
h = Tangent(A, f)
i = Tangent(A, g)
j = Tangent(B, f)
k = Tangent(B, g)
C = Point(j)
D = Point(k)
α = Angle(C, B, D)
E = Point(i)
F = Point(h)
β = Angle(E, A, F)