Several improvements of Mitrinovic-Adamovic and Lazarevics inequalities with applications to the sharpening of Wilker-type inequalities

In this paper, we give several improvements of Mitrinović-Adamović s inequality and Lazarević s inequality. Our results show some interesting relationships between Mitrinović-Adamović s inequality and Lazarević s inequality. At the end of the paper, the improved Lazarević s inequality is applied to the sharpening of Wilker-type inequalities for hyperbolic functions.