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(2x-y)^4-(2x+y)^4
=[(2x-y)^2-(2x+y)^2]*[(2x-y)^2+(2x+y)^2]
=[(2x-y)+(2x+y)]*[(2x-y)-(2x+y)]*[8x^2+2y^2]
=-16xy(4x^2+y^2)
=[(2x-y)^2-(2x+y)^2]*[(2x-y)^2+(2x+y)^2]
=[(2x-y)+(2x+y)]*[(2x-y)-(2x+y)]*[8x^2+2y^2]
=-16xy(4x^2+y^2)
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