How to get the Real and Imaginary part of an expression

*To*: mathgroup at smc.vnet.net*Subject*: [mg129323] How to get the Real and Imaginary part of an expression*From*: "Eduardo M. A. M. Mendes" <emammendes at gmail.com>*Date*: Wed, 2 Jan 2013 21:16:27 -0500 (EST)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*Delivered-to*: l-mathgroup@wolfram.com*Delivered-to*: mathgroup-newout@smc.vnet.net*Delivered-to*: mathgroup-newsend@smc.vnet.net

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

**Follow-Ups**:**Re: How to get the Real and Imaginary part of an expression***From:*Murray Eisenberg <murray@math.umass.edu>

**Re: How to get the Real and Imaginary part of an expression***From:*R Martinez <rm.tech@mac.com>

**Re: How to get the Real and Imaginary part of an expression***From:*Bob Hanlon <hanlonr357@gmail.com>

**Re: How to get the Real and Imaginary part of an expression***From:*James Stein <mathgroup@stein.org>