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笔者在多年的高中数学教学过程中,发现学生按照人教版数学必修四中介绍的利用三角函数诱导公式求三角函数值时,容易混淆诱导公式,从而导致求值出错。本文尝试结合三角函数的定义,给出一个求三角函数值的简单方法。我们先回顾人教版数学必修四给出的任意角的三角函数的定义。任意角三角函数的定义:如图1,设α是一个任意角,它的终
The author in many years of high school mathematics teaching process, found that students in accordance with the PEP mathematics compulsory four introduced trigonometric function trigonometric formula using trigonometric function, it is easy to confuse the induction formula, resulting in evaluation error. This paper attempts to combine with the definition of trigonometric functions to give a simple method of finding trigonometric functions. Let us first review the definition of the trigonometric function for any angle given by the mathematics compulsory version of PEP. Definition of Arbitrary Angular Trigonometry: As shown in Figure 1, let α be an arbitrary angle and its end