On Jordan Type Inequalities for Hyperbolic Functions

R Klén, M Visuri, M Vuorinen
2010 Journal of Inequalities and Applications  
This paper deals with some inequalities for trigonometric and hyperbolic functions such as the Jordan inequality and its generalizations. In particular, lower and upper bounds for functions such as (sin x)/x and x/(sinh x) are proved.
doi:10.1155/2010/362548 fatcat:r2fa5bcfl5da3is57lgkbjhhu4