D = 1 (slider from 0 to 10, step 0.1)
C: 1.9
E = 0.95 (slider from 0.3 to 1.2, step 0.05)
B: 10
Fz = 3.5 (slider from -5 to 5, step 0.05)
For(x) = ((Fz * D) * sin((C * atan((B * x) - (E * ((B * x) - atan((B * x))))))))
a: x = 3.14159
l(x) = Fz