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MathGroup Archive 1998

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Re: Mathmatica Problem...

  • To: mathgroup at smc.vnet.net
  • Subject: [mg14348] Re: [mg14320] Mathmatica Problem...
  • From: BobHanlon at aol.com
  • Date: Thu, 15 Oct 1998 00:28:51 -0400
  • Sender: owner-wri-mathgroup at wolfram.com

David,

TrigReduce[Cos[x]^3 Sin[x]^2]

1/16*(2*Cos[x] - Cos[3*x] - Cos[5*x])

% // Simplify

Cos[x]^3*Sin[x]^2

Bob Hanlon

In a message dated 10/13/98 3:59:28 AM, d.j.winstanley at ic.ac.uk wrote:

>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???


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