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MathGroup Archive 2012

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Re: How Expand?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg127836] Re: How Expand?
  • From: "Nasser M. Abbasi" <nma at 12000.org>
  • Date: Sat, 25 Aug 2012 04:27:41 -0400 (EDT)
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  • Reply-to: nma at 12000.org

On 8/24/2012 4:08 AM, news wrote:
> Hi folks,
>
> How can I expand the following :
>
> [ 1 + cos(x) + i sin(x) ]^3
>
> to obtain;
>
> 8 cos(x/2)^3 [cos(3x/2)+ i sin(3x/2)]
>
> Thanks a lot.
>
> Max.
>

can you write things using Mathematica synatx to
be sure one knows what you mean? The above is not
valid syntax.

Also, is 'i' above the Mathematica I or something else?

Either way, try to use ()^3 instead of []^3 and also lookup
the Trig->True option to Simplify.

--Nasser



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