1.

Integrate

Answer»

\frac{ {x}^{2}  + 1}{ \sqrt{ {x}^{4} + 1 }}  \\  \frac{ {x}^{2} + 1 }{ {x}^{2} + 1 }   \\   { {x}^{2} + 1 } =   { {x}^{2} + 1 }  \\  = 0



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