f(x)=

f(x)=

f(x) = x
inputBox1 = Textfield(f)
a = 0 (slider from -5 to 5, step 0.1)
b = 4.2 (slider from -5 to 5, step 0.1)
A: (a, 0)
B: (b, 0)
n = 1 (slider from 1 to 80, step 1)
c = UpperSum(f, a, b, n)
d = LowerSum(f, a, b, n)
text1: "S_n - s_n \approx " + (LaTeX[c - d]) + ""