Science and Education Publishing Turkish Journal of Analysis and Number Theory 2 4 2014 08 21 Refinements and Sharpening of some Huygens and Wilker Type Inequalities 134 139 EN Wei-Dong Jiang Qiu-Ming Luo Feng Qi College of Mathematics, Inner Mongolia University for Nationalities, Tongliao City, Inner Mongolia Autonomous Region, China TJANT2014246 10.12691/tjant-2-4-6 2014 06 30 2014 08 16 2014 08 21 In the article, some Huygens and Wilker type inequalities involving trigonometric and hyperbolic functions are refined and sharpened.