Re: Complex Numbers
- To: mathgroup at smc.vnet.net
- Subject: [mg47475] Re: Complex Numbers
- From: Jon Harrop <jdh30 at cam.ac.uk>
- Date: Wed, 14 Apr 2004 07:16:24 -0400 (EDT)
- Organization: University of Cambridge
- References: <c5gfvh$aqm$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Dana DeLouis wrote:
> Just another technique since it was not mentioned...
>
> v = Re[ComplexExpand[Exp[a*I]*Exp[b*I]]]
>
> -Im[Sin[a+b]]+Re[Cos[a+b]]
>
> Refine[v, Element[{a, b},Reals]]
>
> Cos[a+b]
Is this new in Mathematica 5? It doesn't work in my copy of Mathematica 4.1
for Linux...
Cheers,
Jon.