论文部分内容阅读
在高一平面三角的教学中,对三角函数定义域的求法,一般都采用直观的方法,即通过观察三角函数的图象直接得出结论.但利用这种方法求一些较复杂的三角函数定义域时往往需要作出几个三角函数的图象,这样,一是较麻烦,另外也容易出错.我们在教学中尝试过用“分象限考察法”求三角函数定义域.学生感到有规律可循,步骤较简便,思路清楚.现通过例题说明此种方法.
In the teaching of a high-level plane triangle, the method of the definition of the trigonometric function domain generally adopts an intuitive method, that is, by observing the image of the trigonometric function, the conclusion can be drawn directly. However, some complicated trigonometric function definitions are obtained by using this method. Domains often need to make several images of trigonometric functions. In this way, one is more troublesome, and the other is also prone to errors. We have tried to use the “quadrant search method” to find the domain of the trigonometric function. Students feel regular to follow. The steps are simple and the thinking is clear. This example is illustrated by examples.