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Re: Absolute value

• To: mathgroup at smc.vnet.net
• Subject: [mg110604] Re: Absolute value
• From: Patrick Scheibe <pscheibe at trm.uni-leipzig.de>
• Date: Mon, 28 Jun 2010 02:27:19 -0400 (EDT)

Hi,

try to use ComplexExpand.

Cheers
Patrick

On Sun, 2010-06-27 at 04:55 -0400, Marco Masi wrote:
> I would like to calculate the absolute value of complex quantities. For example Abs[Exp[I phi1]+Exp[I*phi2]], which sould give 2 (1+cos(phi1-phi2)). However it does not work. I tried to use real numbers as assumtion, but it always answers "Abs[Exp[I phi1]+Exp[I*phi2]]". What am I doing wrong?
> 
> Regards, Mark.
>