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f(x) = x^2 + 4
Dominio = (-infinito, + infinito) o todos los reales
Rango = [4, +infinito
f(x) = raiz cuadrada de (x^2 - 5) + 6
Dominio = Todos los reales -[-raiz cuadra de 5, +raiz cuadrada de 5]
rango = [6, +infinito)
f(x) = (x-5)/(x+3)
Dominio = Todos los reales -{-3}
Rango = Todos los reales -{1}