f(x) = x^(3) - x^(2) + 17
A = Point(f)
g = Tangent(A, f)
fp = Derivative(f)
fpA: fp(A)
texte1: "f'(X_A)=" + (LaTeX[fpA]) + ""
fpp = Derivative(fp)
fppA: fpp(A)
texte2: "f''(X_A)=" + (LaTeX[fppA]) + ""