b

a

b = 1
a = -1 (slider from -5 to 5, step 0.1)
g(x) = x + 1.0
f(x) = x^(3.0) - 3.0 * x + 1.0
h(x) = abs(f(x) - g(x))
A, B, C = Intersect(f, g)
a_1 = Integral(h, a, b)
b_1: x = b
c: x = a
Text1: "Zwischenfläche = " + a_1