平面三角这门课程中,三角变换占着一定篇幅,求值、化简、论证以及解三角方程等都离不开它。因此,一定要使学生熟练地掌握好三角变换的基本方法与常用技巧。不少书上,归纳出三角变换证明题类型的方法是什么“从左边证到右边”或“从右边证到左边”或“两边证到同一个式子”等等,都只谈到现象,似未抓住实质。 In the course of the plane triangle, the trigonometric transformation takes up a certain amount of space. Evaluating, simplifying, validating, and solving the triangular equations are all inseparable from it. Therefore, students must be proficient in mastering the basic methods and common techniques of triangular transformation. In many books, the method of summarizing the type of the triangulation proof question is called “from the left side to the right side” or “from the right side to the left side” or “two sides to the same side” and so on. It does not seem to capture the substance.