New Bounds for the Sine Function and Tangent Function

Ling Zhu
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Ling Zhu: Department of Mathematics, Zhejiang Gongshang University, Hangzhou 310018, China

Mathematics, 2021, vol. 9, issue 19, 1-12

Abstract: Using the power series expansion technique, this paper established two new inequalities for the sine function and tangent function bounded by the functions x 2 sin ( ? x ) / ( ? x ) ? and x 2 tan ( ? x ) / ( ? x ) ? . These results are better than the ones in the previous literature.

Keywords: Mitrinovi?–Adamovi?-type inequality; Becker–Stark-type inequality; circular functions (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2021
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