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函数y=xsinx+cosx在下面哪个区间内是增函数(     )

发布时间:2021-07-16

A.http://picflow.koolearn.com/upload/papers/20140824/20140824050723642770.png

B.http://picflow.koolearn.com/upload/papers/20140824/20140824050723657813.png

C.http://picflow.koolearn.com/upload/papers/20140824/20140824050723673533.png

D.http://picflow.koolearn.com/upload/papers/20140824/20140824050723689583.png

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