若不定积分∫f(x)dx=x+C\int f(x)dx = \sqrt{x} + C∫f(x)dx=x+C,则f(x)=f(x) =f(x)=( ).
(A)12x\dfrac{1}{2\sqrt{x}}2x1
(B)−x-\sqrt{x}−x
(C)−12x-\dfrac{1}{2\sqrt{x}}−2x1
(D)x\sqrt{x}x
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