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RE: Trigonometric simplification - newbe question
*To*: mathgroup at smc.vnet.net
*Subject*: [mg49031] RE: [mg49004] Trigonometric simplification - newbe question
*From*: "David Park" <djmp at earthlink.net>
*Date*: Tue, 29 Jun 2004 04:50:08 -0400 (EDT)
*Sender*: owner-wri-mathgroup at wolfram.com
Walter,
Add an assumption to Simplify (In Version 5, at least).
expr = (4*(2*a*Sin[(n*Pi)/2] - a*Sin[n*Pi]))/(n^2*Pi^2);
Simplify[expr, n \[Element] Integers]
(8*a*Sin[(n*Pi)/2])/(n^2*Pi^2)
But I don't know how one would specify in the assumptions that n was an even
integer greater than zero, say.
David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/
From: Christensen [mailto:fedderwi at uni-bremen.de]
To: mathgroup at smc.vnet.net
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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