f(x) = x^(2.0) - 3.0 * x + 3.0
a = -1
b = 3
c: x = a
d: x = b
n = 34 (slider from 0 to 100, step 0.1)
e = UpperSum(f, a, b, n)
g = LowerSum(f, a, b, n)
h = Integral(f, a, b)