prove that (x+y)^3-- (x-y)^3-6y(x^2-y^2)= 8y^3
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· (a - b) 3 = a 3 - 3a 2b + 3 ab 2 - b 3. = x3 + 3x2y + 3xy2 + y3 - (x3 - 3x 2y + 3xy2 - y3) - 6yx2+ 6y3. = x3 + 3x2y + 3xy2 + ...
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