摘要：设f0(x)=sinx,f1(x)=f0/(x),f2(x)=f1/(x),--,fn+1(x)=fn/(x),则f2008(x)=
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设f0(x)=sinx,f1(x)=f0′(x),f2(x)=f1′(x),…,fn+1(x)=fn′(x),n∈N,则f2 005(x)等于( )
A.sinx B.-sinx C.cosx D.-cosx
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设f0(x)=sinx,f1(x)=f0′(x),f2(x)=f1′(x),…,fn+1(x)=fn′(x),n∈N,则f2 009(x)等于( )
A.cosx B.sinx C.-sinx D.-cosx
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设f0(x)=cosx,f1(x)=f0′(x),f2(x)=f1′(x),…,fn+1(x)=fn′(x),n∈N,则f2006(x)等于( )
A.sinx B.cosx C.-sinx D.-cosx
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