$$2 { a }^{ 2 } { b }^{ 2 } -4 { c }^{ 4 }$$
$2\left(a^{2}b^{2}-2c^{4}\right)$
$$2\left(a^{2}b^{2}-2c^{4}\right)$$
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$2\left(\left(ab\right)^{2}-2c^{4}\right)$
