Factoring by Sum of cubes AND difference of squares?

Difference of Two Squares: a^2 - b^2 = (a + b)(a - b) Sum and Difference of Two Cubes: a^3 - b^3 = (a - b)(a^2 + ab + b^2) a^3 + b^3 = (a + b)(a^2 - ab + b^2) Substitute for a and be as appropriate. : ) e.g. xy^4+x^4y = xy(x^3 + y^3) = xy(x + y)(x^2 - xy + y^2).

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