a = 2.6 (slider from -10 to 10, step 0.1)
c = 0 (slider from -10 to 10, step 0.01)
d = 0 (slider from -10 to 10, step 0.1)
b = 1.4 (slider from -10 to 10, step 0.1)
f(x) = a * sin(b * x - c) + d