Given the function f$,$ of$,$ x$,$ equals, minus, start root, start index, $6,$ end index, x$,$ to the power $5,$ end root, commaf$($x$)=$

$6$

x

$5$

$$

$,$ find f$,$ prime, of$,$ x$,.$f

$$

$($x$).$ Express your answer in radical form without using negative exponents, simplifying all fractions.