不少三角函数基础问题看似很简单 ,但稍不注意就会出错 .多做这样的习题 ,有利巩固基础知识和发展思维能力 .下面是汇集了经常发生在同学们练习中的一套容易做错的三角基础题 ,并在题后给出易错点的分析及解答 ,供同学们复习三角函数时参考 .判断下列命题的真假1.已知α ,β都 A lot of trigonometric foundation problems seem to be very simple, but if you do not pay attention, you will make mistakes. Doing more exercises will help you to consolidate basic knowledge and develop your thinking skills. The following is a collection of easy-to-do exercises that often take place in classmates’ exercises. The wrong triangle basic question, and gives the analysis and answer of the error-prone point after the question, for the students to review the trigonometric function reference. To determine the true and false of the following propositions 1. Known α, β are