Factorize:
$x^{2} - 1 - 2 x - x^{2}$

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Solution

$x^{2} - 1 - 2 x - x^{2}$
$= - 1 - 2 x$
$- (2 x + 1)$

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x^{2} + \frac{1}{x^{2}} - 2 x - \frac{2}{x} + 2

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