กณฝสฬฬณฝp`fสiปฬQTSj
x=cos(mฮ/h),m={1,3,5,EEE,2n-1},h=2n๐๐ฦท้๛๖ฎ
ฎ(x-cos(mฮ/h))=0
๐lฆ้
ฐx=(sinฮ)/2sin(nฮ/2n)=0
ๆ่
ฎ(x-cos(mฮ/h))=x^n-(ฐx)xn-1+EEE=0
ฑ๊ช
Tn(x)=cosnฦ=0, x=cosฦ
ษศ้ฑฦชlฆร็ขฬล ้ชAฦ=(2k-1)ฮ/2nอTn(x)=0๐ซณน้