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Question: how to get Sin[n*Pi]=0 (n integer)


Hi,

How can one tell Mathematica to simplify Sin[n Pi]=0 or
Cos[n Pi]=(-1)^n and similar kind of stuff.

Also, how does one tell it "A" & "B" are matrices so it doesn't 
commute them (AB.not equal.BA).

Thanks.
)

--
Ilija I Zovko
izovko at phy.hr


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