$$(a^{2}-b^{2}); (a^{2}+b^{2})$$
$a^{4}-b^{4}$
$$\left(a^{2}\right)^{2}-\left(b^{2}\right)^{2}$$
$$a^{4}-\left(b^{2}\right)^{2}$$
$$a^{4}-b^{4}$$
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