A general refinement of Jordan's inequality and a refinement of L. Yang's inequality

作者：Niu Da Wei; Huo Zhen Hong; Cao Jian; Qi Feng^*

来源：Integral Transforms and Special Functions, 2008, 19(3-4): 157-164.

DOI：10.1080/10652460701635886

• Jordan's inequality
• L. Yang's inequality
• L'Hospital's rule
• refinement
• application

In the article, a general double refinement of Jordan's inequality,
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for n is an element of N, is established, where the coefficients alpha(k) and beta(k) defined by recursing formulas (9) and (10) are the best possible. As an application, L. Yang's inequality is refined.

• 出版日期2008-4
• 单位华东师范大学; 河南理工大学