【命题趋势】本部分内容历来为高考命题的热点,主要考查三角函数的基本概念、图象性质、“和、差、倍”公式的运用以及和解三角形、和向量的结合等。试题大都来源于课本中的例题、习题的变形,因此复习时应立足于课本、着眼于提高。分析2009年的全国高考试题,有关三角函数的 Proposition trend This part of the history has always been the hot topic of college entrance examination, the main test of the basic concept of trigonometric functions, the nature of the image, “and, poor, times,” the use of the formula and the reconciliation of triangles, and vector combination. Most of the questions come from the textbook examples, the deformation of exercises, so the review should be based on the textbook, focusing on improving. Analysis of the 2009 national college entrance examination questions, the trigonometric functions