Abstract
In this paper we study two-sided inequalities of trigonometric and hyperbolic functions.
абстрактный
В этой статье мы изучаем двусторонние неравенства для тригонометрических и гиперболических функций.
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Bhayo, B.A., Sándor, J. On certain old and new trigonometric and hyperbolic inequalities. Anal Math 41, 3–15 (2015). https://doi.org/10.1007/s10476-015-0102-9
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DOI: https://doi.org/10.1007/s10476-015-0102-9