f(x) = 1 + sin(x) / x
g(x) = If[0 ≤ x ≤ 100, f]
ε = 0.2 (slider from 0 to 0.5, step 0.05)
h(x) = 1 - ε
k(x) = 1 + ε
i: y = 1
A = 6 (slider from 0 to 30, step 0.1)
j: x = A