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“三角函数的定义及其基本性貭”这一部分的复习內容包括教本第一章0°到360°的角的三角函数,第二章弧与角的弧度制,第三章任意角的三角函数。这是全部中学三角課的基础,必須深透的加以复习,根据几年来高三三角总复习的实际經驗,使我們充分认識到,把三角函数的定义及其基本性貭放在主导地位对它的复习多用一些精力、多占一些时間是必要的、也是位得的。在复习順序上,可以将第二章弧与角的弧度制及第三章中§18角的概念的普遍化,§19終边相同的角綜合成“角的形成和度量”,在复习好正角負角及其单位換算的基础上,再将一、三两章概括起来,使学生通过复习能对三角函数的定义及其基本性貭有一系統深刻而又巩固的认識,并以概念指导形成熟练的运算技能技巧,具体作法如下。
The review of the “Definitions and Basic Properties of Trigonometric Functions” section includes the trigonometric functions of the first chapter from 0° to 360°, the second chapter arcs and angles, and the trigonometric functions of the third chapter. . This is the basis of all the middle school triangle courses and must be thoroughly reviewed. Based on the practical experience of the total review of the senior high school students over the past few years, we have fully realized that the definition of the trigonometric function and its basic characteristics lie in its dominant position. It is necessary and worthwhile to review more energy and more time. In the review sequence, we can generalize the arc system of the second chapter arc and angle and the generalization of the concept of the §18 angle in the third chapter. The same angle as the §19 terminal is synthesized into the “angle formation and measurement”. On the basis of the positive angle negative angle and its unit conversion, the first and third chapters are summarized, so that students can have a deep and solid understanding of the definition and basic characteristics of the trigonometric function through the review, and use the concept as a concept. Guide the formation of skilled computing skills, specific practices are as follows.