Re: exponentials to sines and cosines
- To: mathgroup at smc.vnet.net
- Subject: [mg42647] Re: exponentials to sines and cosines
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Sat, 19 Jul 2003 03:19:31 -0400 (EDT)
- Organization: Universitaet Leipzig
- References: <bf8ern$5la$1@smc.vnet.net>
- Reply-to: kuska at informatik.uni-leipzig.de
- Sender: owner-wri-mathgroup at wolfram.com
Hi, FullSimplify[ExpToTrig[expr], Element[x, Reals]] Regards Jens Will Self wrote: > > 1. How do I get Mathematica to rewrite (-1)^(1/3) in standard rectangular > form? > > 2. The following function was returned by Mathematica as the solution of a > differential equation. This function is real. How do I get Mathematica to > write it in terms of Sines and Cosines? > > f[x_]=(1 + E^(x + (-1)^(1/3)*x) + E^((-1)^(1/3)*x + (-1)^(2/3)*x))/ > E^((-1)^(1/3)*x) > > Thanks.