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已知f1(x)=sinx+cosx,fn+1(x)是fn(x)的导函数,即f2(...
已知f1(x)=sinx+cosx,fn+1(x)是fn(x)的导函数,即f2(x)=f1′(x),f3(x)=f2′(x),…,fn+1(x)=fn′(x),n∈N+,则f2013(x)=( )
A.sinx+cos
B.sinx-cos
C.-sinx+cos
D.-sinx-cos
考点分析:
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