p^4+p^3-p^2+1 by p-1
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p=1
p^4+p^3-p^2+1
1^4 +1^3 -1^2+1
1+1-1+1
=0
p^4+p^3-p^2+1
1^4 +1^3 -1^2+1
1+1-1+1
=0
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