同角三角函数公式很多,但重要的是基本关系。在讲清概念的前提下,为便于学生记忆,将六个函数放在正六边形的六个顶点上,中心为1(见图),组成的关系可编为口诀: The formula of trigonometric trigonometry is many, but the important one is the basic one. To clarify the concept of the premise, in order to facilitate student memory, the six functions on the hexagonal six vertices, the center of 1 (see Figure), the composition of the relationship can be compiled as formulas: