三角函数是研究函数性质的重要载体,是高中数学的基础内容,是高考考查的重点内容之一.同学们在学习或复习三角函数时,既要注重三角函数知识的基础性,突出三角函数的图象、周期性、单调性、奇偶性、对称性等性质,以及化简、求值和最值等重点内容,又要注重三角函数知识的工具性,突出三角函数与代数、几何、向量的综合联系,以及三角函数知识的应用意识. Trigonometric function is an important carrier to study the nature of the function, is the basic content of high school mathematics, is one of the key elements of college entrance examination test.Study or review of trigonometric functions, students should not only pay attention to the basic knowledge of trigonometric functions, highlight the trigonometric functions Image, cyclicality, monotonicity, parity and symmetry, as well as some important contents such as simplification, evaluation and most value, but also pay attention to the instrumental knowledge of trigonometric functions, highlighting the trigonometric functions and algebra, geometry, vector Comprehensive contact, and the application of knowledge of trigonometric functions.