a

b

a = 0 (slider from 0 to 20, step 0.1)
f(x) = 3 * x^(2)
A: (a, 0)
b = 2 (slider from a to 20, step 0.1)
B: (b, 0)
c = Integral(f, a, b)
h = Function(f, 0, 1000)
texte1: "H_{" + a + "}(" + b + ") = " + c + " unités d'aire."