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函数的定义域和值域是函数的基本要素。求函数的值域有多种方法。利用原函数与其反函数之间的关系,可借助于求反函数的定义域的方法来求原函数的值域。
The function’s definition domain and value domain are the basic elements of the function. There are several ways to find the range of a function. Using the relationship between the original function and its inverse function, the range of the original function can be found by means of the domain of the inverse function.