关于(k)=∑sin~kA-∑cos~kA(k=3,5)的上下界

On the Supremum and Infimum of ■(k)=∑sin~k A-∑cos~k A(k=3,5)

通过局部地采用优超方法给出了三角函数（k）=∑sinkA－∑coskA（k=3。

In this paper,using partially the method of Majorization,we give the supremum and infimum of the triangle function of (k) = ∑sink A - ∑ cosk A(k=3, 5)