tangente

g = Function((-3.5E-4 * x^(2)) + (0.997 * x) + 8000, 0, 2849)
A = Point(g)
Trajectoire2 = Tangent(A, g)
M = Point(Trajectoire2)
a = Tangent(A, g)
B = Point(g)
b = Line(A, B)
pente = Slope(b)