On Jordan's and Kober's inequality

Authors

Barkat Ali Bhayo Koulutuskeskus Salpaus (Salpaus Further Education), Lahti
József Sándor Babeş-Bolyai University, Department of Mathematics, Str. Kogalniceanu nr. 1 400084 Cluj-Napoca

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

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

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