Answer
$99!$
Work Step by Step
$P(x)$ = $x^{99}+...$
$P'(x)$ = $99x^{98}+...$
$P''(x)$ = $99\times98x^{97}+...$
$P'''(x)$ = $99\times98\times97x^{96}+...$
$P^{99}(x)$ =$99!x^{0}$ = $99!$
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