Cas a= 0.5

Cas a = 1

Cas a = 3

Cas a = 10

f(x) = exp((-x^(2)) / 2)
a = 0.5 (slider from 0 to 50, step 0.1)
I = Integral(f, 0, a)
texte1: "I(" + (LaTeX[a]) + ") ≈ " + (LaTeX[I]) + ""