A = (9.758966947992784, 4.902254350460578)
B = (3.7958221603436093, 2.6969493254423913)
C = (12.881678863418534, 1.3384814300311878)
f = Ray(B, A)
g = Ray(B, C)
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α = Angle(C, B, A)
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β = Angle(A, B, C)
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