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1. $a - \frac{1}{a} = 3$

Answer: Option C

Explanation:

a^{2} - \frac{1}{a^{2}} = {(a - \frac{1}{a})}^{2} + 2 . a . \frac{1}{a} = {(3)}^{2} + 2 = 9 + 2 = 11

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