\(=\left(x^6+2x^5+x^4\right)-2\left(x^3+x^2\right)+1\)
\(=\left(x^3+x^2\right)^2-2\left(x^3+x^2\right)+1\)
\(=\left(x^3+x^2-1\right)^2\)
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