`(y + X) (y + x)^(3) = CX^(4) e^(--4x)``(y -x) (y + x)^(3) = cx^(4) e^(-4x)``(y -x) (y -x)^(3) = cx^(4) e^(-4x)``(y + x) (y -x)^(3) = cx^(4) e^(-4x)`
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