# Tricky!

Calculus Level 5

Let $f\left( x \right) =\displaystyle \int _{ 2 }^{ x }{ \frac { dx }{ \sqrt { 1+{ x }^{ 4 } } } }$ and $g$ be the inverse of $f$. If $g'\left( 0 \right) =n$ then find ${ n }^{ 2 }$.

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