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\[ \begin{eqnarray} && (x+y)(x-y) \\ &&+ \dfrac{1}{2!} (x+y)(x-y)(x^2 + y^2) \\ &&+ \dfrac{1}{3!} (x+y)(x-y)(x^4 + y^4 + x^2 y^2 ) \\ &&+ \ldots \\ &&= \ ? \end{eqnarray} \]

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