已知函数y=Asin(wx+φ)(其中A,w,φ为常数,且A>0,w>0)的图像或部分图像,怎样确定它的解析式呢?解决问题的关键在于确定参数A,w,φ的值.而A的值一般可由图像上的最大值、最小值点来确定,即A= (y_(max)-y_(min))/2=y_(max)=-y_(min);w的值一般可根据T=(2π)/w, Knowing that the function y=Asin(wx+φ) (where A, w, φ is a constant, and A>0, w>0) is an image or part of an image, how does one determine its analytical expression? The key to solving the problem is to determine The values ​​of the parameters A, w, and φ. The value of A can generally be determined by the maximum and minimum points on the image, that is, A=(y_(max)-y_(min))/2=y_(max)=- The value of y_(min);w can generally be based on T=(2π)/w,