f(x) = (0.003 * x^(4)) - (0.045 * x^(3)) + (0.1 * x^(2)) - (0.5 * x) + 10
A = Point(f)
B = Point(f)
g = Line(A, B)
texte1: "Pente :\\\frac{f(a)-f(b)}{a-b}\\=\frac{" + (LaTeX[y(A)]) + "-" + (LaTeX[y(B)]) + "}{" + (LaTeX[x(A)]) + "-" + (LaTeX[x(B)]) + "}\\=" + (LaTeX[(y(A) - y(B)) / (x(A) - x(B))]) + ""
h(x) = (-f'(x))