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Logical evaluation

• To: mathgroup at smc.vnet.net
• Subject: [mg82249] Logical evaluation
• From: Michael Mandelberg <mmandelberg at comcast.net>
• Date: Tue, 16 Oct 2007 03:27:40 -0400 (EDT)

I can't figure out why the following does not evaulate to TRUE:

In[100]:= \[ExponentialE]^(-\[ImaginaryI] x) + \[ExponentialE]^(\
\[ImaginaryI] x) == 2 TrigToExp[Cos[x]]

Out[100]= \[ExponentialE]^(-\[ImaginaryI] x) + \[ExponentialE]^(\
\[ImaginaryI] x) ==
 2 (\[ExponentialE]^(-\[ImaginaryI] x)/
    2 + \[ExponentialE]^(\[ImaginaryI] x)/2)

Any ideas?

Michael Mandelberg

• Follow-Ups:
  • Re: Logical evaluation
    • From: Syd Geraghty <sydgeraghty@mac.com>
  • Re: Logical evaluation
    • From: Andrzej Kozlowski <akoz@mimuw.edu.pl>