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根据图象确定函数 ｙ =Ａｓｉｎ(ｗｘ + φ)的解析式这类问题的难点是确定初相 φ .下面介绍一种求初相 φ的简捷方法———图象平移法 .大家知道函数ｙ =Ａｓｉｎｗｘ的图象通过适当的平移可得到函数 ｙ =Ａｓｉｎ(ｗｘ + φ)的图象 ,因此可以根据两函数图象的平移关系来确定
The difficulty in solving the problem of the analytic function of the image determination function y = Asin(wx + φ) is to determine the initial phase φ. The following describes a simple method for finding the initial phase φ—image translation method. Everyone knows the function y. The image of =Asinwx can get the image of function y =Asin(wx + φ) by proper translation, so it can be determined according to the translation relationship between the images of two functions.