a = 1 (slider from -5 to 5)
b = 0 (slider from -5 to 5)
k = 1 (slider from -5 to 5)
h = 0 (slider from -5 to 5)
f(x) = (a * sin((k * (x - b)))) + h
g(x) = (a * cos((k * (x - b)))) + h