f(x) = ((-0.5) * (x - 1.28)^(2)) + 0.9699912408759124
u = 1
a = 1 (slider from -5 to 5, step 0.05)
t = Integral(f, u, a)
b: x = a
abszisse: a
ordinate: t
A: (abszisse, ordinate)