An identity related to Jordan's inequality

Jian-Lin Li

International Journal of Mathematics and Mathematical Sciences, 2006, vol. 2006, 1-6

Abstract:

The main purpose of this note is to establish an identity which states that the function sin x / x is a power series of ( π 2 − 4 x 2 ) with positive coefficients for all x ≠ 0 . This enable us to obtain a much stronger Jordan's inequality than that obtained before.

Date: 2006
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Persistent link: https://EconPapers.repec.org/RePEc:hin:jijmms:076782

DOI: 10.1155/IJMMS/2006/76782

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