trifoglio equilatero

cartesiana

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

y = ± √((x - a)/(3x+a))

+ √

- √

a = 3 (slider from -5 to 5, step 0.1)
b: x * (x^(2) - 3 * y^(2)) = a * (x^(2) + y^(2))
f(x) = sqrt((x - 2) / (3 * x + 2))
g(x) = -sqrt((x - 2) / (3 * x + 2))