$$(x^{4}+2x^{2}+1)-(x^{4}-2x^{2}+1)$$
$4x^{2}$
$$x^{4}+2x^{2}+1-x^{4}+2x^{2}-1$$
$$2x^{2}+1+2x^{2}-1$$
$$4x^{2}+1-1$$
$$4x^{2}$$
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