Wang, Xiaohua Discussion on the proof of a function inequality. (Chinese. English summary) Zbl 1091.26501 J. Guangxi Univ. Nationalities, Nat. Sci. 11, No. 3, 48-50 (2005). MSC: 26D05 Inequalities for trigonometric functions and polynomials 26D15 Inequalities for sums, series and integrals Keywords:integral inequality; trigonometric functions PDFBibTeX XMLCite \textit{X. Wang}, J. Guangxi Univ. Nationalities, Nat. Sci. 11, No. 3, 48--50 (2005; Zbl 1091.26501)