Answer
$a^{20}b^{48}$
Work Step by Step
$(a^{5}b^{12})^{4}$
$=(a^{5})^{4}(b^{12})^{4}$
$=(a^{5\times4})(b^{12\times4})$
$=(a^{20})(b^{48})$
$=a^{20}b^{48}$
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