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MathGroup Archive 1998

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Re: Mathmatica Problem...

  • To: mathgroup at smc.vnet.net
  • Subject: [mg14365] Re: [mg14320] Mathmatica Problem...
  • From: Jurgen Tischer <jtischer at col2.telecom.com.co>
  • Date: Thu, 15 Oct 1998 00:29:05 -0400
  • Organization: Universidad del Valle
  • References: <199810130521.BAA08622@smc.vnet.net.>
  • Sender: owner-wri-mathgroup at wolfram.com

Hallo David,
I couldn't bring Mathematica to do what you want with Expand (in a sense
your formula is expanded, isn't it?). But I found a way playing around
to get your result anyway. (I used the AlgebraicManipulation palette.)
So use in this order on your formula: TrigToExp, Expand, ExpToTrig.

Jurgen


Mr D.J. Winstanley wrote:
> 
> Dear mathgroup,
> 
> We have just upgraded to release 3 of mathematica and we  have found a
> problem with the Expand function as described in the mathematica
> manual.  Here is the mathematica 3.0 output...
> 
> In[3]:= Expand[Cos[x]^3 Sin[x]^2,Trig->True]
> 
> gives
> 
>               3       2
> Out[3]= Cos[x]  Sin[x]
> 
> 
> this is not the answer given in the manual, which is...
> 
>   Cos[x] - Cos[3 x] - Cos[5 x]
>   ------   --------   --------
>     8         16         16
> 
> We were led to believe that the new version was compatible with the
> previous version.
> 
> Is there a switch to obtain compatibility???
> 
> Any comments on this would be appreciated.  Also who should I send this
> to at Wolfram?
> 
> thanks for your help
> 
> David Winstanley
> IT Services Manager
> Electrical and Electronic Engineering Department Room 1002, E&EE
> Building
> Imperial College
> Exhibition Road
> LONDON SW7 2BT
> 
> Phone: 0171-594-6273 or extn. 46273
> Fax:   0171-823-8125
> E-mail: d.j.winstanley at ic.ac.uk



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