[tex]\displaystyle x+y-x^3y-x^4=x+y-x^3(y+x)=(y+x)(1-x^3)=(y+x)(1-x)(1+x+x^2)[/tex]
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[tex]\displaystyle x+y-x^3y-x^4=x+y-x^3(y+x)=(y+x)(1-x^3)=(y+x)(1-x)(1+x+x^2)[/tex]