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在高一课本中,“正弦函数和余弦函数的图象”是通过平移正弦线和余弦线描点而后连线得到的。这样从讲解到作出曲线往往要花费较多时间。根据我的体会,若使用三角函数绘图器则只要几分钟就可以了,而且绘出的图形连续,图象上点的位置与函数线的对应关系一目了然。可以说使用这种绘图器教学,具有原理简明、图象连续、演示生动、绘图省时的特点。现将我设计的这种绘图器介绍如下。
In high school textbooks, “images of sine functions and cosine functions” are obtained by translating sinusoidal lines and cosine lines to draw points and then connecting them. It usually takes more time from explanation to curve making. According to my experience, if you use the trigonometric function plotter, it will take only a few minutes, and the graphs drawn will be continuous, and the corresponding relationship between the positions of the points on the image and the function lines will be clear at a glance. It can be said that the use of such a plotter teaching has the characteristics of concise principle, continuous image, vivid presentation, and time-saving drawing. Now I will design this kind of plotter as follows.