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26D05 Inequalities for trigonometric functions and polynomials (4 articles)

• Zhu, Lai-Yi; Zhou, Da-Peng: On the proof of Erdős' inequality. (English). Czechoslovak Mathematical Journal, vol. 67 (2017), issue 4, pp. 967-979
• Fechner, Włodzimierz: Some inequalities connected with the exponential function. (English). Archivum Mathematicum, vol. 44 (2008), issue 3, pp. 217-222
• Heinig, Hans P.: Modular inequalities for the Hardy averaging operator. (English). Mathematica Bohemica, vol. 124 (1999), issue 2, pp. 231-244
• Alzer, Horst: An inequality for the coefficients of a cosine polynomial. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 36 (1995), issue 3, pp. 427-428