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

Abstract

Abstract 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).

Keywords

• sharpening
• generalization
• Shafer-Fink’s double inequality
• arc sine function