题目内容
已知函数f(x)=x?cos2x,则f(x)的导函数f′(x)=( )
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试题答案
A
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已知函数f(x)=x•cos2x,则f(x)的导函数f′(x)=( )
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已知函数f(x)=x•cos2x,则f(x)的导函数f′(x)=
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- B.cos2x-xsin2x
- C.cos2x+2xsin2x
- D.cos2x+xsin2x