Abstract
In 1970, J.B. Kelly proved that
We generalize and complement this inequality. Moreover, we present sharp upper and lower bounds for the related sums
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Alzer, H., Liu, X. & Shi, X. Inequalities for Alternating Trigonometric Sums. Results. Math. 63, 1215–1223 (2013). https://doi.org/10.1007/s00025-012-0264-8
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DOI: https://doi.org/10.1007/s00025-012-0264-8