1. 已知函数 f ( x )=sin x +ln x ,则 f ′(1)的值为 ( )
A 1-cos1 B 1+cos1 C cos1-1 D -1-cos1
2. 满足 f ( x )= f ′( x )的函数是( )
A f ( x )=1- x B f ( x )= x C f ( x )=0 D f ( x )=1
3. 设 f 0 ( x ) = sinx , f 1 ( x )= f 0 ′( x ), f 2 ( x )= f 1 ′( x ),…, f n+1 ( x ) = f n ′( x ), n ∈N,则 f 2005 ( x )=
A. sinx B.- sinx C.cos x .- cosx D