Re: ComplexExpand off by a factor of (-1)?

*To*: mathgroup at smc.vnet.net*Subject*: [mg129893] Re: ComplexExpand off by a factor of (-1)?*From*: Bert RAM Aerts <bert.ram.aerts at gmail.com>*Date*: Sat, 23 Feb 2013 07:02:46 -0500 (EST)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*Delivered-to*: l-mathgroup@wolfram.com*Delivered-to*: mathgroup-newout@smc.vnet.net*Delivered-to*: mathgroup-newsend@smc.vnet.net*References*: <kg71rg$4mb$1@smc.vnet.net>

On Friday, February 22, 2013 7:05:36 AM UTC+1, charl... at 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