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高中数学苏教版中在推导正弦定理、余弦定理时用了将向量等式转化为数量关系,比如余弦定理证明如下:
In the high school mathematics and Jiangsu Sujiao edition, the vector equations are transformed into quantitative relations when deriving the sine theorem and cosine theorem. For example, the cosine theorem is proved as follows: