$$64 a ^ { 8 } - b ^ { 8 }$$
$\left(8a^{4}-b^{4}\right)\left(8a^{4}+b^{4}\right)$
$$\left(8a^{4}-b^{4}\right)\left(8a^{4}+b^{4}\right)$$
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$64a^{8}-b^{8}$
