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汉语拼音：yú xián dìng lǐ

关于三角形的任意一边的平方等于其他两边的平方和减去这两边与它们夹角的余弦的积的两倍的定理。即a2＝b2+c2-2bc玞os玜，b2＝c2+a2-2cacosb，c2＝a2+b2-2abcosc。

• Cosine is unilateral in its many applications to the specific problems of specific problem-solving methods choose the good.

  正余弦定理都在其片面有好多应用，现就详细问题详细选择出较好的解题办法。

• Is, Cosine rich content, wide range of uses.

  正、余弦定理内在丰厚，用处普遍。

• Argumentation and Application of Law of Sines and Cosines at Not Known Dot Setting Survey Dot of Theodolite Lead

  正余弦定理在经纬仪导线非已知点设站的探讨

• Application of Cosine Law in Azimuth Determination of a New Roadway

  余弦定理给定新开切巷道方位时的应用

• The Law of Cosines and news classification

  余弦定理和新闻的分类

• New Proofs of the n-Dimensional Sine Theorem and Cosine Theorem

  n维正弦定理和余弦定理的新证明

• Sin-Cosine Theorem and Its Application

  正余弦定理及应用

• Cosine theorem and Pythagorean theorem in space

  立体几何的余弦定理和勾股定理

• Solving the Helen Theorem with the Cosine Theorem

  用余弦定理证明海伦公式