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MathGroup Archive 2004

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Re: Trigonometric simplification - newbe question

  • To: mathgroup at smc.vnet.net
  • Subject: [mg49014] Re: [mg49004] Trigonometric simplification - newbe question
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Tue, 29 Jun 2004 04:49:41 -0400 (EDT)
  • Reply-to: hanlonr at cox.net
  • Sender: owner-wri-mathgroup at wolfram.com

Simplify[
  (4*(2*a*Sin[(n*Pi)/2] - a*Sin[n*Pi]))/(n^2*Pi^2), 
  Element[n, Integers]]

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


Bob Hanlon

> 
> From: fedderwi at uni-bremen.de (Christensen)
To: mathgroup at smc.vnet.net
> Date: 2004/06/28 Mon AM 04:13:48 EDT
> To: mathgroup at smc.vnet.net
> Subject: [mg49014] [mg49004] Trigonometric simplification - newbe question
> 
> 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
> 
> 


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