单项选择题
A.-4B.4C.-16D.16
A.-1B.0C.1D.2
A.(-∞,1)B.(-1,1)C.(1,+∞)D.(-∞,+∞)
A.sin(1+x2)B.-2xsin(1+x2)C.sin(1+x2)dxD.-2xsin(1+x2)dx
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