જો \(x + \left( {\frac{1}{x}} \right) = 12\) અને \({x^2} - \frac{1}{{{x^2}}} = 50 \) , પછી \({x^4} - \frac{1}{{{x^4}}} \) ની કિંમત:

1
1800
2
600
3
7200
4
7100 

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