Zhu, Ling A new simple proof of Wilker’s inequality. (English) Zbl 1084.26008 Math. Inequal. Appl. 8, No. 4, 749-750 (2005). Cited in 21 Documents MSC: 26D05 Inequalities for trigonometric functions and polynomials PDF BibTeX XML Cite \textit{L. Zhu}, Math. Inequal. Appl. 8, No. 4, 749--750 (2005; Zbl 1084.26008) Full Text: DOI