三角变换题目类型多,许多同学做题不知道从什么地方入手,特别是高一初学三角函数的学生更是觉得困难;三角问题特点是公式多,解题思路的入口宽;笔者教学中发现,产生这种现象的原因,一方面是学生把三角公式没有熟练掌握,不能灵活运用,另一方面是由于思考问题的方法不当,思路方向容易出现偏差,钻进了死胡同.三角变换的过程,其实就是 Triangular transformation of many types of questions, many students do not know where to start, especially high school beginner trigonometry function is more difficult for students; triangle problem is characterized by many formulas, problem-solving ideas wide entrance; the author found in teaching, The reason for this phenomenon is that on the one hand, students can not apply the trigonometry formula well and can not flexibly use it. On the other hand, due to the improper method of thinking, the deviation of thinking direction and the blind alleyway, the process of triangle transformation is actually That’s it