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Trigonometric simplification - newbe question

• To: mathgroup at smc.vnet.net
• Subject: [mg49004] Trigonometric simplification - newbe question
• From: fedderwi at uni-bremen.de (Christensen)
• Date: Mon, 28 Jun 2004 04:13:48 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

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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