Write down the factors of x^7+xy^6
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=x(x^6+y^6)
=x[(x^3)^2+(y^3)^2]
=x(x^3-(-y^3)^2]
=x[x^3+(-y^3))*(x^3-(-y^3)]
=x(x^3-y^3)*(x^3+y^3)
=x[(x^3)^2+(y^3)^2]
=x(x^3-(-y^3)^2]
=x[x^3+(-y^3))*(x^3-(-y^3)]
=x(x^3-y^3)*(x^3+y^3)
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