(x+3Y)^2(x-3y)^2
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(x+3Y)^2(x-3y)^2(x+3Y)^2(x-3y)^2(x+3Y)^2(x-3y)^2=(x²-9y²)²
(x+3Y)^2(x-3y)^2
(x+3Y)^2(x-3y)^2
(x+3Y)^2(x-3y)^2
=(x²-9y²)²
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