doppio cuore di Cramer

f(x) = sqrt(4 * x) + sqrt(4 * x - x^(2))
g(x) = sqrt(4 * x - sqrt(4 * x - x^(2)))
h(x) = -sqrt(4 * x) + sqrt(4 * x - x^(2))
p(x) = -sqrt(4 * x) - sqrt(4 * x - x^(2))