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1. $x + \frac{1}{x} = 2$

Answer: Option B

Explanation:

দেওয়া আছে, a+ \frac{1}{a} =2 a^{3} + \frac{1}{a^{3}} = {(a + \frac{1}{a})}^{3} - 3 . a . \frac{1}{a} . (a + \frac{1}{a}) = 2^{3} - 3 \times 2 = 8 - 6 = 2

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