Verify x^3 +y^3 =(x+y) (x^2 -xy +y^2)
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x^3 + y^3 = x^3-x^2y+xy^2+x^2y-xy^2+ y^3
x^3+y^3 = x^3+y^3
x^3+y^3 = x^3+y^3
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