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(x+y)^4 = 1 x^4 + 4(x^3 y) + 6(x^2 y^2) + 4(x y^3) + 1 (y^4)
(x+y)^4 = x^4 + 4 x^3 y + 6 x^2 y^2 + 4 x y^3 + y^2