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§4.8正弦函数、余弦函数的图象和性质重难点解读1.正弦函数的图象叫做___________,余弦函数的图象叫做________________.
§4.8 Images and properties of the sine and cosine functions Interpretation of the hard and hard points 1. The image of the sine function is called ___________, and the image of the cosine function is called ________________.