Date: Jul 10, 2013 12:10 AM
Author: gbnbgb
Subject: rationalize

How can I rationalize the denominator of an expression?

(1)??1/(5^(1/3) + 7^(1/3) + 69^(1/3))





(2)??1/(5^(1/3) + 7^(1/3) + 69^(1/3)+Sqrt[19])