Refinements and generalizations of certain inequalities involving trigonometric and hyperbolic functions

Abstract

Inequalities involving trigonometric and hyperbolic functions are established. Obtained results provide refinements or generalizations of inequalities proved by Adamovic and Mitrinovic, Cusa, Huygens, Lazarevic and others. Some of the results included in this paper are obtained with the aid of the Schwab-Borchardt mean.