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1. $x - \frac{1}{x} = 1$

Answer: Option C

Explanation:

x^{3} - \frac{1}{x^{3}} = {(x - \frac{1}{x})}^{3} + 3 . x . \frac{1}{x} . (x - \frac{1}{x}) = {(1)}^{3} + 3 \times 1 = 4 A n s w e r : 4

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