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ComplexExpand off by a factor of (-1)?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg129882] ComplexExpand off by a factor of (-1)?
  • From: charles.ces at gmail.com
  • Date: Fri, 22 Feb 2013 01:05:24 -0500 (EST)
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Would someone be able to help me understand why when I enter the expression:

ComplexExpand[(E^(I*y) - E^(-I*y))/2*I] I get a result of -Sin[y] instead of Sin[y]?

Thanks.

Charles S.



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