# JEE Problem

Level pending

Let f be a real valued function defined on the interval $$(-1,1)$$ such that $${ e }^{ -x }f\left( x \right) =2+\int _{ 0 }^{ x }{ \sqrt { { t }^{ 4 }+1 } dt }$$, for all $$x\epsilon (-1,1)$$ and let $$f^{ -1 }$$ be the inverse funtion of $$f$$. Then, $$(f^{ -1 })'(2)$$ is equal to

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