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周期函数是高中数学的重要概念,要正确理解周期函数的定义,应从定义的内涵(性质)和外延(对象)两个方面来分析。
Periodic function is an important concept of high school mathematics. To understand the definition of periodic function correctly, we should analyze it from the connotation (nature) and extension (object) of the definition.