folium parabolico

cartesiana

x^3 = a *(x^2-y^2)+b*x*y

modifica a, b

a = -4.5 (slider from -5 to 5, step 0.1)
b = 1.8 (slider from -5 to 5, step 0.1)
c: x^(3) = a * (x^(2) - y^(2)) + b * x * y