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MathGroup Archive 2004

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Re: Trigonometric simplification - newbe question

  • To: mathgroup at smc.vnet.net
  • Subject: [mg49036] Re: [mg49004] Trigonometric simplification - newbe question
  • From: DrBob <drbob at bigfoot.com>
  • Date: Tue, 29 Jun 2004 04:50:15 -0400 (EDT)
  • References: <200406280813.EAA04280@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

(4*(2*a*Sin[(n*Pi)/2] -
     a*Sin[n*Pi]))/(n^2*Pi^2);
Simplify[%, {n > 0,
    n \[Element] Integers}]

(8*a*Sin[(n*Pi)/2])/(n^2*Pi^2)

Bobby

On Mon, 28 Jun 2004 04:13:48 -0400 (EDT), Christensen <fedderwi at uni-bremen.de> wrote:

> Hi,
>
> this is a Mathematica newbe question for sure:
>
> Mathematica comes up with the following result:
>
>        (4*(2*a*Sin[(n*Pi)/2] - a*Sin[n*Pi]))/(n^2*Pi^2)
>
> Now I have the additional assumption that n is element of
> {1,2,3, ...) (and a is real)
>
> How do I tell Mathematica to take this into consideration and
> remove the Sin[n*Pi] term?
>
> Thanks,
> Walter
>
> Trigonometric simplification - newbe question
>
>



-- 
DrBob at bigfoot.com
www.eclecticdreams.net


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