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人教版B版1.2.3中,三角函数的两个最基本关系式,它是学习三角函数的定义后安排的一节继续深入学习的内容,是求三角函数值,化简三角函数式,证明三角恒等式的基础工具,是整个三角函数的基础,,在教材中起到承上启下的作用。同时,它体现的数学思想与方法,在整个中学数学的学习中起重要作用。当我们知道一个角的某一个三角函数值时,利用这两个关系式和三角函数的定义,就可以求出这个角的其余三角函数值。
People’s Education Edition B version 1.2.3, the two most basic trigonometric relations, it is learning the definition of trigonometric functions to continue the section of a deep learning content, is to find the trigonometric function value, simplify the trigonometric function, Prove the basic principle of triangular identity, is the basis of the entire trigonometric function, play a role in the textbook. At the same time, it reflects the mathematical ideas and methods that play an important role in the learning of mathematics in middle school. When we know a certain trigonometric value of an angle, the values of the other trigonometric functions for that corner can be found using the definitions of these two relations and trigonometric functions.