Abstract
The aim of this paper is to refine Jordan–Stečkin and Becker–Stark inequalities.
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Debnath, L., Mortici, C. & Zhu, L. Refinements of Jordan–Stečkin and Becker–Stark Inequalities. Results. Math. 67, 207–215 (2015). https://doi.org/10.1007/s00025-014-0405-3
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DOI: https://doi.org/10.1007/s00025-014-0405-3