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Mathematical Problems in Engineering
Volume 2017, Article ID 9237932, 5 pages
Research Article

Sharp Refinements for the Inverse Sine Function Related to Shafer-Fink’s Inequality

Department of Mathematics and Computer Sciences, “Dunărea de Jos” University of Galaţi, 111 Domnească Street, 800201 Galaţi, Romania

Correspondence should be addressed to Gabriel Bercu; or.lagu@ucrebg

Received 9 April 2017; Accepted 2 July 2017; Published 2 August 2017

Academic Editor: Kishin Sadarangani

Copyright © 2017 Gabriel Bercu. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The aim of our work is to give new sharp refinements of Shafer-Fink’s inequality, using suitable changes of variables.