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in Limit, continuity and differentiability by (45 points)
Q.7 \( \operatorname{Lim}_{n \rightarrow \infty} n^{2}\left(\sqrt{1+\frac{1}{n}}+\sqrt{1-\frac{1}{n}}-2\right) \) equals (A) \( \frac{1}{2} \) (B) \( \frac{-1}{2} \) (C) \( \frac{1}{4} \) (D) \( \frac{-1}{4} \)

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