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« Area and Difference Formulas • The Law of Cosines II »
September 22, 2007
余弦定理
——Timothy A. Sipka
the-law-of-cosines-i
注释1:作者是密歇根州艾尔玛学院数学系副教授,研究方向是图论、数学史、方法论、数学教育。
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