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Re: Simplification question


snoofly schrieb:
> 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.
> 
see http://groups.google.com/groups?selm=dc16i2%246q5%241 at online.de&rnum=1

the behaviour of Mathematica is rather strange (in my eyes):

 FullSimplify[(-1)^(3*m), m \[Element] Integers]
yields
 Cos[3*m*Pi]

-- 
Peter Pein
Berlin
http://people.freenet.de/Peter_Berlin/


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