Fonction dérivée
Author: Guy Marion
Date: 12/06/05

Joseph Louis Lagrange

C_f(x) = 0.002 * (x + 5.93) x^(3) * (x - 6.07)
f' = Derivative(C_f)
M = Point(C_f)
a = OrthogonalLine(M, xAxis)
Tangente = Tangent(M, C_f)
m_0 = Slope(Tangente)
T1: "f(" + (x(M)) + ") = " + (C_f(x(M)))
P = Intersect(f', a)
D = Intersect(a, xAxis)
T2: "f'(" + (x(M)) + ") = " + (f'(x(M)))