三角函数是高中数学的基础知识,是高考考查的重要内容之一,但由于三角公式多,变化多,很多同学不能很好把握,而要真正把握三角函数的本质,我们不仅要记住公式,更重要的是要抓住公式的特征,有利于在解题时观察分析题设、结论间的差异和联系,同时掌握三角函数的常用思考、联想的问 The trigonometric function is the basic knowledge of high school mathematics, and it is one of the important contents of the college entrance examination. However, because many formulas and changes in the triangular formula are many, many students cannot grasp it well. To truly grasp the essence of trigonometric functions, we must not only remember the formula, More importantly, it is necessary to grasp the characteristics of the formula, which helps to observe the differences between the analysis questions and conclusions and the relations between the conclusions when solving the questions. At the same time, the common thinking and association of the trigonometric functions are grasped.