摘要
本文利用微分的方法推广著名的Kober不等式cosx≥1-2/πx,x∈[0,π/2],给出了它的上界,改进了其下界.本文所用方法具有一定的普遍性,所得到的结果从某种意义上讲是最优的.
In this article the authors extend the noted kober's incquality, obtain some inequalities which are sharps in some senses. The method used in this article could yield more general results.
基金
河南省青年科学基金
