Afficher A et la tangente

a = 5.3 (slider from 1 to 10, step 0.1)
b = 1.7 (slider from 0 to 10, step 0.1)
p = Function(exp(-a * exp(-b * x)), 0, 50)
A = Point(p)
c = Tangent(A, p)
d: y > 2
e = false