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x=4/2
x=2
[/tex] \sqrt{ x^{2} + x^{-2}-3 } [/tex]
[/tex] \sqrt{2^{2}+ 2^{-2}-3 } [/tex]
√(x^2+x^(-2)-3)
√(x^2+x^6)
x^2/2+x^6/2
x + x^3 = 2 + 2^3= 10