It seems reducible if I follow the criterion directly, but I know this is not so.
Thanks in advance.
$x^{12}+1=(x^4+1)(x^8-x^4+1)$
Therefore not irreducible over $\mathbb{Q}$
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$x^{12}+1=(x^4+1)(x^8-x^4+1)$
Therefore not irreducible over $\mathbb{Q}$