已知定义在R上的函数是偶函数, 对时,的值为              

已知定义在R上的函数是偶函数,

时,的值为                        (    )

       A.2      B.-2   C.4       D.-4

答案

B


解析:

因为定义在R上函数是偶函数,所以,故函数以4为周期,所以

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