PianoTangIperboloide

f: z = x^(2) - y^(2)
P: (0, 0, 0)
A = (-2.542817628651532, -0.5025946894728133, 1.3490242444603764)
g = Line(A, P)
B, C = Intersect(g, f)
h: z = 0
D = PointIn(h)
i = Line(D, P)