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On the Strengthened Jordan's Inequality

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Author(s): Li Jian-Lin | Li Yan-Ling

Journal: Journal of Inequalities and Applications
ISSN 1025-5834

Volume: 2007;
Issue: 1;
Start page: 074328;
Date: 2007;
Original page

ABSTRACT
The main purpose of this paper is to present two methods of sharpening Jordan's inequality. The first method shows that one can obtain new strengthened Jordan's inequalities from old ones. The other method shows that one can sharpen Jordan's inequality by choosing proper functions in the monotone form of L'Hopital's rule. Finally, we improve a related inequality proposed early by Redheffer.
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