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a = 2x
b = y
(2x - y)^3 = (2x)^3 - 3.(2x)^2.y + 3.y^2.2x - y^3
= 8x^3 - 3.4x^2y + 3,2x.y^2 - y^3
= 8x^3 - 12x^2y + 6xy^2 - y^3