a = 1 (slider from -5 to 5, step 1)
b = 1 (slider from -5 to 5, step 1)
c = 1 (slider from -5 to 5, step 1)
d = 1 (slider from -5 to 5, step 1)
f(x) = (a * cos((b * x) + c)) + d