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algebraic number...
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KY...
Posted: Fri Nov 06, 2009 5:01 pm
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It is a phenomenon waiting anxiously in vain.
http://www.youtube.com/watch?v=1sfZDWse0Lg&feature=related
Please teach an evasion measure.
It is certain that it is an algebraic number.
m = 7;
FunctionExpand[Cos[Pi/m]]
RootReduce[%]
%//Timing

m = 17;
FunctionExpand[Cos[Pi/m]]
RootReduce[%]
%//Timing
-----------------------------------------------
http://www.youtube.com/watch?v=1sfZDWse0Lg&feature=related
http://www.ikukokawai.com/
http://video.google.co.jp/videosearch?sourceid=navclient&hl=ja&rlz=1T4GGLG_jaJP315JP315&q=Kawai+ikuko&um=1&ie=UTF-8&ei=HeL0SumjMMz-kAXy7omlAw&sa=X&oi=video_result_group&ct=title&resnum=10&ved=0CC8QqwQwCQ#

m = 117
FunctionExpand[Cos[Pi/m]]
RootReduce[%]
%//Timing
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