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In this paper, we give some sharper refinements and generalizations of inequalities related to Shafer-Fink’s inequality for the inverse sine function stated in Theorems 1, 2, and 3 of Bercu (Math. Probl. Eng. 2017: Article ID 9237932,  2017 ).

Refinements and generalizations of some inequalities of Shafer-Fink’s type for the inverse sine function