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1. $x + \frac{1}{x} = \sqrt{5}$

A. $1$
B. $1$
C. $1$
D. $1$

Answer: Option D

Explanation:

x³+(1/x)³

=(x+1/x)³-3×x×(1/x)×(x+1/x)

=(√5)³-3√5

=2√5

(ans)

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