Answer
$y^{33}z^{39}$
Work Step by Step
$(y^{11}z^{13})^{3}$
$=(y^{11})^{3}(z^{13})^{3}$
$=(y^{11\times3})(z^{13\times3})$
$=(y^{33})(z^{39})$
$=y^{33}z^{39}$
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