Verify that $f$ has an inverse. Then use the function $f$ and the given real number $a$ to find $(f^{-1}{)}^{\text{'}}(a).($Hint: See Example $1.$ If an

answer does not exist, enter DNE.$)$

$f(x)=\sqrt[\phantom{2}]{x-4},x>4,a=2$

$(f^{-1}{)}^{\text{'}}(2)=$

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