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现行初中《代数》第四册、高中《代数》上册巧妙地运用辅助圆证明了余弦定理和两角和的余弦公式.本文对辅助圆的应用作进一步的探讨,以展示辅助圆应用的广泛性,挖掘教材中有关方法的重要性.
The current junior high school “Algebra” volume 4 and the high school “Algebra” volume use the auxiliary circle to substantiate the cosine theorem and the cosine formula of the two-cornered sum. This paper further discusses the application of the auxiliary circle to demonstrate the wide application of the auxiliary circle. , To tap the importance of relevant methods in the textbook.