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教材中引入导数为研究函数的性质提供 了新的工具．利用导数定义求导是本章重要内 容之一．根据导数定义求导可进一步理解导数 的概念．
The introduction of derivatives in textbooks provides new tools for investigating the nature of functions. Defining derivative by derivative is one of the important contents of this chapter. Derivation can be further understood based on derivative definitions.