Date: Feb 23, 2013 7:01 AM
Author: Bert RAM Aerts
Subject: Re: ComplexExpand off by a factor of (-1)?

On Friday, February 22, 2013 7:05:36 AM UTC+1, charl...@gmail.com wrote:
>
> ComplexExpand[(E^(I*y) - E^(-I*y))/2*I] I get a result of -Sin[y] instead of Sin[y]?



If you expect Sin[y] as answer, you probably meant /(2*I) in stead of /2 *I