(3x-y)^2 - 4y^2 = (3x-y-2y)(3x-y+2y) = (3x-3y)(3x+y) = 3(x-y)(3x+y)
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(3x-y)^2 - 4y^2 = (3x-y-2y)(3x-y+2y) = (3x-3y)(3x+y) = 3(x-y)(3x+y)