设f0(x)=cos x,f1(x)=f0′(x),f2(x)=f1′(x),…,fn+1(x)=fn′(x),n∈
N,则f2 011(x)等于 ( ).
A.sin x | B.-sin x |
C.cos x | D.-cos x |
推荐套卷
设f0(x)=cos x,f1(x)=f0′(x),f2(x)=f1′(x),…,fn+1(x)=fn′(x),n∈
N,则f2 011(x)等于 ( ).
A.sin x | B.-sin x |
C.cos x | D.-cos x |