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正弦型曲线y=Asin(wx+)+b的作法,是三角教学中的一个难点。统编高中数学课本采取了以下几个步骤来解决这个问题: (1)用P_(107)例1,说明怎样由y=sinx的图象得到y=Asinx(A>0)的图象。 (2)用P_(108)例2,说明怎样由y=sinx的图象得到y=sinwx(w>0)的图象。
The sinusoidal curve y=Asin(wx+)+b is a difficult point in triangular teaching. Unified high school mathematics textbooks take the following steps to solve this problem: (1) Using P_(107) Example 1 to illustrate how to obtain an image of y=Asinx(A>0) from the image of y=sinx. (2) Using P_(108) Example 2 to illustrate how to obtain an image of y=sinwx(w>0) from the image of y=sinx.