Date: Jan 2, 2013 9:14 PM
Author: emammendes@gmail.com
Subject: How to get the Real and Imaginary part of an expression

Hello

I need to extract the real and imaginary part of the following expression

(w=882)/(s^2+2*z*w*s+w^2)

where w and z are positive constants.  s is a complex variable.

Applying Re and Im to the expression does not do much.   By hand, one can easily find them. 

What am I missing?

many thanks

Ed