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为了描述现实世界中运动、变化着的现象,人们在数学中引入了函数。刻画静态现象的数与刻画动态现象的函数都是数学中非常重要的概念。如果说函数是贯穿高中数学的一条主线,那么单位圆就是贯穿三角函数教学的一条主线。为什么这样说呢?因为现行的人教A版教材是利用单位圆处理三角函数的定义、三角函数线、诱导公式以及两角和与差的正余弦。笔者认为,以单位圆为载体研究三
In order to describe the real world movement, changing phenomenon, people have introduced a function in mathematics. The numbers that characterize static phenomena and those that characterize dynamic phenomena are all very important concepts in mathematics. If the function is a main line running through high school mathematics, then the unit circle is the main line through the teaching of trigonometry. Why do you say that? Because the current people teach A version of the text is the use of unit circle handle the definition of trigonometric functions, trigonometric functions, induction and two-way and with the difference between cosine and cosine. The author believes that the unit circle as a carrier study three