Consider about the following function
f(x, y) = y^3 + 6x^2y - 6x^2 - 6y^2 + 3
One of the function's four crucial points, which is a saddle point, is at $(\sqrt{\frac{3}{2}}, 1)$. Locate three
additional crucial points for the function and designate each one as a saddle point, maximum,
or minimum.