高中数学代数与函数一函数练习题48
题目内容

设f(x)是以2为周期的奇函数,且f(- http://picflow.koolearn.com/upload/2013-05/06/5a5e8e9d-12ff-4768-b04f-e638d4675374/paper.files/image017.png)=3,若sinα= http://picflow.koolearn.com/upload/2013-05/06/5a5e8e9d-12ff-4768-b04f-e638d4675374/paper.files/image018.png,则f(4cos2α)=      (     )

2021-07-28

A.-3

B.3

C.-http://picflow.koolearn.com/upload/2013-05/06/5a5e8e9d-12ff-4768-b04f-e638d4675374/paper.files/image018.png

D.http://picflow.koolearn.com/upload/2013-05/06/5a5e8e9d-12ff-4768-b04f-e638d4675374/paper.files/image018.png

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