纵观多年的高考试题,不难发现三角函数问题越来越被重视。由于三角函数类题型是研究周期性现象的重要工具,揭示着角度与边长之间的关系,具有知识点多、信息量大等特点,成了学生们学习的重难点,因此,很多学生在求解三角函数类问题时没有头绪,甚至产生了厌学的情绪。所以,如何帮助学生们解决当下的困惑,成了教学的首要目标。经过多年的教学分析,我发现利用“设而不求”的方法,起到了不错的效果。 Throughout many years of college entrance examination exam questions, it is not difficult to find that the problem of trigonometric functions more and more attention. As the trigonometric function test questions is an important tool to study the cyclical phenomena, revealing the relationship between the angle and the side length, with more knowledge and more information, has become a heavy difficulty for students to learn, therefore, many students There is no clue when solving the trigonometric functions and even the dislike of emotions. Therefore, how to help students to solve the current confusion has become the primary goal of teaching. After years of teaching analysis, I found that the use of “set instead of ” method, has played a good effect.