Question

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y^3-y^2x-y x^2+x^3

Answer 1

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