Answer
$ (x-y^2)(x^2 +xy^2 + y^4) $
Work Step by Step
$x^3 - y^6 = x^3 - (y^2)^3 =(x-y^2)(x^2 +xy^2 + (y^2)^2) = (x-y^2)(x^2 +xy^2 + y^4) $
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