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1. $x^{4} - x^{2} + 1 = 0$

Answer: Option D

Explanation:

x^{4} - x^{2} + 1 = 0 o r, x^{2} + \frac{1}{x^{2}} = 1 o r, x + \frac{1}{x} = \sqrt{3} এখন , x^{3} - \frac{1}{x^{3}} = {(x + \frac{1}{x})}^{3} - 3 . x . \frac{1}{x} . (x + \frac{1}{x}) = 3 \sqrt{3} - 3 \sqrt{3} = 0

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