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MathGroup Archive 2005

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Re: Cross results?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg63207] Re: [mg63201] Cross results?
  • From: Curtis <gardyloo at mail.wsu.edu>
  • Date: Mon, 19 Dec 2005 07:00:59 -0500 (EST)
  • References: <200512181234.HAA24522@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

   I don't really know the real answer to your question, but it _does_ 
evaluate to zero for any substitution into the arguments of the trig. 
functions. Also, if you use rational coefficients (the 2.5 and 0.0 don't 
matter, but set 0.12 to 12/100 in the appropriate spots), you get the 
required result.

   Just adding more confusion to my own mind!

         C.O.

On Sun, 18 Dec 2005, Virgil Stokes wrote:

> I have the following
>
>  x=.
>  Cross[{10 Sin[x],-10 Cos[x],2.5},{0.12 Sin[x],-0.12 Cos[x], 0.0}]
>
> which gives,
>
>  {0.3 Cos[x], 0.3 Sin[x], 0.Cos[x]Sin[x]}
>
> why does it not set the last term to 0.0?
>


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