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E

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PT \Leftrightarrow $\sqrt{x^4+1}=5x-x^2-1$

\Rightarrow $x^4+1=x^4+25x^2+1-10x^3-10x+2x^2$

\Leftrightarrow $27x^2-10x^3-10x=0$

\Leftrightarrow $x(10x^2-27x+10)=0$

\Leftrightarrow ...
 
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