a = 0.4 (slider from -10 to 10, step 0.1)
c: (x / a)^(2.0) + y^(2.0) = 1.0
b = -4 (slider from -10 to 10, step 0.1)
d = 1.2 (slider from -10 to 10, step 0.1)
e = 2.6 (slider from -10 to 10, step 0.1)
f(x) = x^(3.0) + b * x^(2.0) + d * x + e