Expand (x - y)^3 using the binomial theorem.

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

x^3 + 3x^2y + 3xy^2 + y^3

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

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

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