三角函数在高考中占有较重要的地位,2005年的全国高考试题I(山西、河南、河北、安徽)中有三小一大题合26分.有些题目看似不难,但因对隐含的条件考虑不周往往失误丢分,本部分内容对学生思维的严谨性和深刻性要求较高,重点考察学生的观察能力和分析能力.本文对三角中两类典型问题 The trigonometric function occupies a more important position in the college entrance examination. In 2005, the national examination questions I (Shanxi, Henan, Hebei, and Anhui) had a total of 26 points in three small topics. Some of the topics seem not difficult, but because of the implied Mistakes in terms of misconceived and often missed points, this part of the content of the student’s thinking of the rigorous and profound requirements are high, focusing on the students’ observation ability and analytical ability. This article on the triangle in the two types of typical problems