✨ Best Answer ✨
x^4+x^2+1
=x^4+2x^2+1-x2
=(x^2+1)^2-x^2
A^2-B^2=(A+B)(A-B)
なので、
=(x^2+1+x)(x^2+1-x)
=(x^2+x+1)(x^2-x+1)
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