Absolute value of a symbolic complex expression

*To*: mathgroup at smc.vnet.net*Subject*: [mg62190] Absolute value of a symbolic complex expression*From*: "mailcwc at gmail.com" <mailcwc at gmail.com>*Date*: Sun, 13 Nov 2005 21:16:39 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

I have a long complex equation with all symbols real. How do I get the Abs of that equation. For example, Abs[a + i b] =Sqrt[a^2 +b^2]