A = F(b) - f(a)

f(x) = (x - 1.0) * (x - 4.0) * (-(x) + 1.0)
A = Point(xAxis)
B = Point(xAxis)
a = Integral(f(x), 0.0, x(A))
b = Integral(f(x), x(A), x(B))
c = Integral(f(x), 0.0, x(B))
Text5: "b = " + (x(B))
Text4: "a = " + (x(A))
Text2: "F(b) = \int_0^" + (x(B)) + "f(x) dx = " + c
Text1: "F(a) = \int_0^" + (x(A)) + "f(x) dx = " + a
Text3: "\int_" + (x(A)) + "^" + (x(B)) + "f(x) dx = F(" + (x(B)) + ") - F(" + (x(A)) + ") = " + c + " - " + a + " = " + b