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《湖南数学通讯》1984年第2期刊登了“托勒密定理在三角中的应用举例”一文,读后很受启发。本文中想举几例,说明托勒密定理在证一些特殊不等式的应用。
The article “Application of Ptolemy theorem in trigonometry” published in “Hunan Mathematical Newsletter” No. 2 in 1984 was very inspiring after reading. In this article, I want to cite a few examples to show that Ptolemy’s theorem proves the application of some special inequalities.