Question

$integrate \frac{x^{2}+1 }{\sqrt{x^4 +1} }$

Answer 1

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

Answer 2

$\frac{ {x}^{2} + 1 }{ \sqrt{ {x}^{4} } + 1 }$

$\frac{ {x}^{2} + 1 }{ {x}^{2} + 1}$

${x}^{2} + 1 = {x}^{2} + 1$

$= 0$

Hope it helps you......