三角函数是重要的基本初等函数之一,它和代数、几何有着密切的联系,是研究其它知识的重要工具,因而也是高考对基础知识和基本技能考查的重要内容之一.但许多同学因对三角知识理解不够准确、深刻,运用技巧不够熟练,解题时常犯以下错误,现采撷数例加以 The trigonometric function is one of the important basic elementary functions. It is closely related to algebra and geometry and is an important tool for studying other knowledge. Therefore, it is also one of the important contents of the examination of basic knowledge and basic skills. The understanding of triangular knowledge is not accurate and profound. It is not skillful to use techniques. When solving problems, the following mistakes are often made.