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Re: ComplexExpand off by a factor of (1)?
 To: mathgroup at smc.vnet.net
 Subject: [mg129887] Re: ComplexExpand off by a factor of (1)?
 From: Bill Rowe <readnews at sbcglobal.net>
 Date: Sat, 23 Feb 2013 07:00:46 0500 (EST)
 Deliveredto: lmathgroup@mailarchive0.wolfram.com
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On 2/22/13 at 1:05 AM, charles.ces at gmail.com wrote:
>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]?
You get Sin[y] because that is the correct answer. You probably intended
In[4]:= ComplexExpand[(E^(I*y)  E^(I*y))/(2*I)]
Out[4]= Sin[y]
that is divide by 2 I rather than divide by 2 and *multiply* by
I as you did. And since 1/I = 1 you got the correct result
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