Intersection de deux tangentes - Epreuve pratique
Author: Patrice Debart

D = (5, 0)
f(x) = (exp(1.0 + x) + exp(1.0 - x)) / 2.0
C = (-5, 0)
CD = Segment(C, D)
g(x) = (exp(1.0 + x) - exp(1.0 - x)) / 2.0
N = Point(CD)
a: x(N)
A: (a, f(a))
B: (a, g(a))
NA = Segment(N, A)
NB = Segment(N, B)
T_A = Tangent(A, f)
T_B = Tangent(B, g)
M = Intersect(T_A, T_B)
lieu4 = Locus(M, N)
e(x) = exp(x)
a_1: x(M)
x_M: (x(M), 0.0)
MxM = Segment(x_M, M)