众所周知涉及到三角函数的有关问题,对于培养学生灵活的变形转化能力和综合运用知识的能力都大有益处,因而在高三复习课中常需要设计相关的问题对学生进行针对性训练.但是,在设计三角题时往往过多关注了知识点的覆盖、三角变换的技巧、题目的新颖,而忽视了三角函数的定义域、值 It is well known that the related issues involving trigonometric functions are of great benefit to students’ flexibility in transforming and transforming their skills and their ability to comprehensively use knowledge. Therefore, in the third grade review class, it is often necessary to design related problems to specifically train students. However, in design Trigonometric questions often pay too much attention to the coverage of knowledge points, trigonometric transformation techniques, novel topics, and ignore the definition of the trigonometric domain, value