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If   x 4 + 1 x 4   \ x^{4}+\frac{1}{x^{4}}\ = 198 and x>0, then what is the value of    x 2 ? 1 x 2 \ x^{2}-\frac{1}{x^{2}} ?

[SSC CPO 4 July 2017 Afternoon Shift With Answers]
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