In this paper, the versions of trigonometric functions of certain known inequalities for hyperbolic ones are proved, and then corresponding inequalities for means are presented.
The integrals in Gradshteyn and Ryzhik. Part9: Combinations of logarithms, rational and trigonometric functions
Closed-form formulae for the derivatives of trigonometric functions at rational multiples of $π$
Sharp Cusa type inequalities for trigonometric functions with two parameters
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