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“两角和与差的三角函数”是“三角函数”一章中的一个重要内容,是三角变换的主要工具,它有一套完整的公式链,而这一公式链的始祖就是cos(α+β).正因为如此,cos(α+β)公式的推导一课的教学,正好让我们挖掘教材,让学生了解知识的发生、发展过程,并在学习中感悟数学经典,学会学习、学会研究.关于此课的教学,过去已有很多文章对它进行过研究,教材也几经修改,对于那些方法本文不再赘述,只想谈谈自己的三种做法和一些体会.教学设计1:(人教版《全日制普通高级中学教科书·数学(必修)》教材设计.)
An important part of the “two-corner and difference trigonometric function” is a trigonometric function chapter. It is the main tool of the trigonometric transformation. It has a complete set of formula chains, and the ancestor of this formula chain is Cos(α+β). Because of this, the teaching of the derivation of the cos(α+β) formula teaches us to dig out the teaching materials so that students can understand the occurrence and development of knowledge and learn the classics of mathematics while learning. Learning, learning to study. In the past, there have been a lot of articles on the teaching of this course. The teaching materials have also been modified. For those methods, this article will not go into details here. I just want to talk about my own three practices and some experiences. Instructional Design 1: (PEP Teacher’s Guide to “Full-time Ordinary High School Textbooks and Mathematics (Compulsory)” Textbook Design.)