T512

f(x) = x - 1 / x
A = Intersect(f, xAxis, (-1, 0))
B = Intersect(f, xAxis, (1, 0))
g = Tangent(A, f)
h = Tangent(B, f)
C = Point(g)
D = Point(h)
E = Point(xAxis)
α = Angle(E, B, D)
β = Angle(E, A, C)