Refined forms of Oppenheim and Cusa-Huygens type inequalities
Keywords:
Cusa-Huygens inequality, trigonometric-polynomial bounds, hyperbolic version, monotonicity, Yang's inequality
Abstract
We rene Oppenheim's inequality as well as generalized Cusa-Huygens type inequalities established recently by some researchers. One of the results where the bounds of sin x / x are tractable will be used to obtain a sharp version of Yang's inequality.
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