cosine law meaning in English

余弦定律
馀弦定律

Solving and measuring parameters by cosine law
利用余弦定理求解测设参数
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
Lambert ' s cosine law
朗伯余弦定律
The importance of the various solutions to one question - supported by the methods of the addition theorem of the cosine law
用余弦的加法定理不同的证明来说明一题多解的重要性