a = -2.05 (slider from -5 to 5)
f(x) = x^(3) + a
b = 0.25 (slider from -5 to 5)
g(x) = sin(x) + b
c = 3.85 (slider from -5 to 5)
h(x) = x^(2) + c
A = Point(xAxis)
B = Point(xAxis)
d = UpperSum(h, x(A), x(B), c)
e = LowerSum(h, x(A), x(B), c)
text1: "Upper Sum = " + d + ""
text2: "Lower Sum = " + e + ""
i = Integral(h, d, e)
text3: "Integral = " + i + ""