Re: exponentials to sines and cosines
- To: mathgroup at smc.vnet.net
- Subject: [mg42655] Re: [mg42603] exponentials to sines and cosines
- From: Selwyn Hollis <selwynh at earthlink.net>
- Date: Sat, 19 Jul 2003 03:19:39 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
On Friday, July 18, 2003, at 05:24 AM, Will Self wrote: > 1. How do I get Mathematica to rewrite (-1)^(1/3) in standard > rectangular > form? (-1)^(1/3)//ComplexExpand or (-1)^(1/3)//ExpToTrig > > 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) Same answer, essentially: Hit it with //ComplexExpand//Simplify or with //ExpToTrig//FullSimplify . ----- Selwyn Hollis http://www.math.armstrong.edu/faculty/hollis