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Absolute value

• To: mathgroup at smc.vnet.net
• Subject: [mg110596] Absolute value
• From: Marco Masi <marco.masi at ymail.com>
• Date: Sun, 27 Jun 2010 04:55:54 -0400 (EDT)

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.