Journal of Mathematical Inequalities · Volume 6, Issue 4

A simple proof of Oppenheim's double inequality relating to the cosine and sine functions

06-63 Pages 645-654 DOI 10.7153/jmi-06-63

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Authors

Feng Qi Qiu-Ming Luo Bai-Ni Guo

Keywords

simple proof Oppenheim's double inequality cosine function sine function monotonicity

Subject classes

33B10 26D05