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Simplify complex equation

• To: mathgroup at smc.vnet.net
• Subject: [mg114406] Simplify complex equation
• From: "mailcwc at gmail.com" <mailcwc at gmail.com>
• Date: Fri, 3 Dec 2010 05:22:08 -0500 (EST)

I tried the following code which attend to extract the real and the
imaginary part of q4.
z, s, f, s2 are all real numbers.
Why I get imaginary part in the first answer and zero in the 2nd
answer?


q1 = Iz;
q2 = q1 + s;
q3 = (q2 f)/(f - q2);
q4 = q3 + s2;
ComplexExpand[Re[q4]]
ComplexExpand[Im[q4]]

Out = s2 + (f s)/(f - s - Iz) + (f Iz)/(f - s - Iz)

Out = 0