μ = 2.3 (slider from -5 to 5, step 0.1)
σ = 1.7 (slider from 0 to 5, step 0.1)
f(x) = 1 / (σ * sqrt(2 * π)) * ℯ^((-(x - μ)^(2)) / (2 * σ^(2)))
a = Integral(f, μ - σ, μ + σ)
b = Integral(f, μ - 2 * σ, μ + 2 * σ)
c = Integral(f, μ - 3 * σ, μ + 3 * σ)
texte1: "" + a + ""