已知函数f(x)=xf(x)=xf(x)=x,则f(1x)=f(\dfrac{1}{x}) =f(x1)=( ).
(A)xxx
(B)x2x^2x2
(C)1x\dfrac{1}{x}x1
(D)1x2\dfrac{1}{x^2}x21
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