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arXiv 1206.5502math.CA
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新的sharp Jordan型不等式及其应用

New sharp Jordan type inequalities and their applications

Zhen-Hang Yang

摘要:

本文证明了对于x \in(0,π/2)(cosp_0x)^{1/p_0}<((sinx)/x)<(cos(x/3))^3,最佳常数p_0=0.347307245464.和1/3。此外,如果p \in(0,1/3],则双重不等式β_{p}(cos px)^{1/p}<((sin x)/x)<(cos px)^{1/p}对x \in(0,π/2)成立,其中β_{p}=2π^-1(cos((pπ)/2))^{-1/p}且1是最佳可能。如果p \in [1/2,1],则其逆1成立。作为应用,建立了一些新的不等式.

英文摘要:

In this paper, we prove that for x\in(0,π/2) (cos p_0x)^{1/p_0}<((sin x)/x)<(cos(x/3))^3 with the best constants p_0=0.347307245464... and 1/3. Moreover, if p\in (0,1/3] then the double inequality β_{p}(cos px)^{1/p}<((sin x)/x)<(cos px)^{1/p} holds for x\in(0,π/2), where β_{p}=2π^-1(cos((pπ)/2))^{-1/p} and 1 are the best possible. Its reverse one holds if p\in[1/2,1]. As applications, some new inequalities are established.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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