a = 10 (slider from 0 to 10, step 1)
b = 4 (slider from 0 to 10, step 1)
f(x) = sin(a * x)
g(x) = sin(b * x)
h(x) = f(x) * g(x)
c = Integral(h(x), 0.0, 6.283185307179586)