The natural approach of Wilker-Cusa-Huygens inequalities

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Bounds for the Ratio of Two Gamma Functions (2009, methodology): “Finally, we would like to recommend the articles [25, 26, 27, 28, 30, 37, 40, 43, 44, 45, 46, 47, 48, 49, 50, 54, 59, 60, 68, 73, 74, 75, 77, 81, 82, 108, 109, 111, 116] and closely related references therein to the readers for finding new developments and applications of the gamma function, polygam”
Sharp Cusa and Becker-Stark inequalities (2011, background): “The inequality is now known as Cusa’s inequality [2-5].”
Two sharp inequalities for trigonometric and hyperbolic functions (2012, unknown): “The inequality is now known as Cusa’s inequality (see [11, 12, 14, 15]).”
On Wilker and Huygens type inequalities (2012, unknown): “[1,2,3,6,8,10,11,12,13,14, 15, 16, 19, 20, 21, 22, 23, 25, 26, 27, 28] and the references cited therein).”
A method for proving some inequalities on mixed trigonometric polynomial functions (2015, methodology): “Mortici used for proving inequalities in the article [26].”