已知函数y=f(x)为可导函数,且,则曲线y=f(x)在(1,f(1))处切线的斜率为 ( )
A.2 B.-2 C.-1 D.1
已知函数y=f(x)为可导函数,且,则曲线y=f(x)在(1,f(1))处切线的斜率为 ( )
A.2 B.-2 C.-1 D.1
A