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正弦定律,余弦定律和正切定律合称三角形的三大定律。这三大定律都是读者熟悉的。本文意在说明这三大定律彼此间的关系,并把它做一个推广。希望读者从中看到
The sine law, the law of cosines, and the law of tangent are the three laws of triangles. These three laws are familiar to the reader. This article is intended to illustrate the relationship between these three laws and to promote it. Hope readers see from it