Answer
$(x^4+1)(x^2+1)$
Work Step by Step
The given expression, $
x^6+x^2+x^4+1
,$ simplifies to
\begin{array}{l}\require{cancel}
(x^6+x^2)+(x^4+1)
\\\\=
x^2(x^4+1)+(x^4+1)
\\\\=
(x^4+1)(x^2+1)
.\end{array}
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