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统编高中《数学》第一册第二章是三角函数。由于在这章之前,学生已学过0°—180°三角函数;集合与对应;一些初等函数及其性质,这样三角函数这一章就带来一些新的特点。本文想就这一章的前四节,谈点个人的看法。 一、角的概念的推广 除按传统的教学以外,我想补充下面两点: 1.关于课本p60—61两个例的教学 例1,在0°到360°的范畴内,找出与下列各角终边相同的角,并判定各是哪个象限的角。 (1) -120°;(2) 640°;(3) -950。12′
The second chapter of the first volume of “Mathematics” in high schools is the trigonometric function. Since before this chapter, students have learned about trigonometric functions of 0°-180°; collections and correspondences; some elementary functions and their properties; this chapter of trigonometric functions brings some new features. This article wants to talk about personal opinions about the first four quarters of this chapter. First, the promotion of the concept of horn In addition to the traditional teaching, I would like to add the following two points: 1. In the teaching example 1 of two examples of textbook p60-61, in the range of 0° to 360°, find out the following The corners of the corners are the same, and the corners of each quadrant are determined. (1) -120°; (2) 640°; (3) -950.12′