Re: Simplify

*To*: mathgroup at smc.vnet.net*Subject*: [mg127669] Re: Simplify*From*: Bill Rowe <readnews at sbcglobal.net>*Date*: Tue, 14 Aug 2012 04:22:01 -0400 (EDT)*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

On 8/13/12 at 3:16 AM, news at newsfe03.iad.highwinds-media.com (news) wrote: >Simplify must result: >Simplify[(1 + Sin[x] - Cos[x])/(1 + Sin[x] + Cos[x]) == Tan[x/2]] >True >but why instead it results: >Simplify[(1 + Sin[x] - Cos[x]) / (1 + Sin[x] + Cox[x]) == Tan[x/2]] >((Cos[x] - Cox[x])*Tan[x/2]) / (1 + Cox[x] + Sin[x]) == 0 typo-----------------------------------^ should be Cos[x] not Cox[x]. Cox[x] would be an unknown function to Simplify which is why it fails to yield the expected result.