问题
选择题
函数y=xsin2x的导数是 [ ]
A.y′=sin2x-xcos2x
B.y′=sin2x-2xcos2x
C.y′=sin2x+xcos2x
D.y′=sin2x+2xcos2x
答案
答案：D
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函数y=xsin2x的导数是 [ ]
A.y′=sin2x-xcos2x
B.y′=sin2x-2xcos2x
C.y′=sin2x+xcos2x
D.y′=sin2x+2xcos2x
答案：D