Ha  2016

c = 0.2
f(x) = sqrt(((x + 2) * (x - 1)^(2)) - c)
a = Surface((f(t) * cos(s)), (f(t) * sin(s)), t, t, -2.5, 10, s, 0, 6.28319)
h = 2.7
g(x, y) = h