On Jordan's and Kober's inequality

Barkat Ali Bhayo, József Sándor

Abstract


We refine some classical inequalities for trigonometric functions, such as Jordan's inequality, Cusa–Huygens's inequality, and Kober's inequality.

Keywords


Cusa–Huygens's inequality; Jordan's inequality; Kober's inequality; trigonometric functions

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DOI: http://dx.doi.org/10.12697/ACUTM.2016.20.09

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ISSN 1406–2283 (print)
ISSN 2228–4699 (online)