Re: Abs help
- To: mathgroup at smc.vnet.net
- Subject: [mg41974] Re: Abs help
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Mon, 16 Jun 2003 03:56:19 -0400 (EDT)
- Organization: Universitaet Leipzig
- References: <bc7on7$6bt$1@smc.vnet.net>
- Reply-to: kuska at informatik.uni-leipzig.de
- Sender: owner-wri-mathgroup at wolfram.com
Hi, FullSimplify[Abs[ExpToTrig[y]]^2, Element[x, Reals]] Regards Jens Rex_chaos wrote: > > hi all, > Here is a expr > y=Exp[I*x]+1; > where x is REAL. I would like to take the absolute value of y > > However, it gives > > In[1]:=Abs[ExpToTrig[y]]^2 > Out[1]=Abs[1 + Cos[2 x] + \[ImaginaryI] Sin[2 x]]^2 > > How can I get the result Sin[2 x]^2 + (1+Cos[2 x])^2 ? > > How to tell mathematica x is REAL? > > Thanks.