=x^10.(x+1)+x^8.(x+1)+x^6.(x+1)+x^4.(x+1)+x^2.(x+1)+(x+1)
=(x+1).(x^10+x^8+x^6+x^4+x^2+1)
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=x^10.(x+1)+x^8.(x+1)+x^6.(x+1)+x^4.(x+1)+x^2.(x+1)+(x+1)
=(x+1).(x^10+x^8+x^6+x^4+x^2+1)
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