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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)
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• Delivered-to: l-mathgroup@wolfram.com
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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>