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Re: Simplification question

• To: mathgroup at smc.vnet.net
• Subject: [mg59081] Re: Simplification question
• From: snoofly <snoofly at snoofly.com>
• Date: Thu, 28 Jul 2005 02:27:13 -0400 (EDT)
• References: <dc76pp$jvg$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

On Wed, 27 Jul 2005 06:41:13 +0100, snoofly <snoofly at snoofly.com> wrote:

> Can someone explain this to me please.
>
> Clear[m]
>
> Simplify[Sin[3 m Pi], Assumptions -> m \[Element] Integers]
> 0
>
> Simplify[Cos[3 m Pi], Assumptions -> m \[Element] Integers]
>
> Cos[3 m \[Pi]]
>
> I'm not sure why Mathematica cannot deduce that the second simplification
> should be (1)^m.
>

That should say (-1)^m of course.