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本文介绍任意角三角函数概念教学的几种不同形式的教学设计并进行分析思考.一、由特殊到一般的教学设计1.创设情境(1)提问:求下列三角函数值sin 30°=,sin 45°=,sin 60°=.(2)提问:在初中我们是如何定义锐角的正弦函数的?(学生回答、教师补充)教师:为了研究方便,我们把锐角α放到直角坐标系中.
This article introduces several different forms of instructional design and analysis thinking of the concept teaching of any angle trigonometry.First, from the special to the general teaching design 1.Creates the situation (1) asks: The following trigonometric function value sin 30 ° =, sin 45 ° =, sin 60 ° =. (2) Question: How do we define the sine function of acute angle in junior high school? (Student’s answer, teacher’s supplement) Teacher: For the sake of convenience, we put the acute angle α into the Cartesian coordinate system.