Some Refinements of Inequalities for Circular Functions

Zhengjie Sun and Ling Zhu

Journal of Applied Mathematics, 2011, vol. 2011, 1-9

Abstract:

We give new lower bound and upper bound for Papenfuss-Bach inequality and improve Ruehr-Shafer inequality by providing a new lower bound.

Date: 2011
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Persistent link: https://EconPapers.repec.org/RePEc:hin:jnljam:869261

DOI: 10.1155/2011/869261

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