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I think A= (x+y)^3 and B= -z^3 because you are asked to find the cube of a BINOMIAL. Therefore, [(x+y)^3]^3+ 3[(x+y)^3]^2(-z^3) + 3[(x+y)^3](-z^3)^2 + (-z^3)^3 You can now find the answer
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