$$x ^ { 3 } y ^ { 6 } - 64 =$$
$\left(xy^{2}-4\right)\left(x^{2}y^{4}+4xy^{2}+16\right)$
$$\left(xy^{2}-4\right)\left(x^{2}y^{4}+4xy^{2}+16\right)$$
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$x^{3}y^{6}-64$
