Answer
$|\sqrt[3]{x}|$
Work Step by Step
$\sqrt[12]{x^{4}}=\quad$
... for even-indexed roots, the result is an absolute value, $\sqrt[2n]{x^{m}}=|x^{m/2n}|$
$=|x^{\frac{4}{12}}|$
$=|x^{\frac{1}{3}}|$
=$|\sqrt[3]{x}|$
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