Refined estimates and generalizations of inequalities related to the arctangent function and Shafer's inequality
Summary: We give some sharper refinements and generalizations of inequalities related to Shafer's inequality for the arctangent function, stated in Theorems 1, 2, and 4 in [\textit{C. Mortici} and \textit{H. M. Srivastava}, Colloq. Math. 136, No. 2, 263--270 (2014; Zbl 1305.26010)].
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