limx→2(1x−2−4x2−4)=\lim\limits_{x \to 2}(\dfrac{1}{x - 2} - \dfrac{4}{x^2 - 4}) =x→2lim(x−21−x2−44)=( ).
(A)12\dfrac{1}{2}21
(B)14\dfrac{1}{4}41
(C)−14-\dfrac{1}{4}−41
(D)∞\infty∞
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