Пожалуйста, помогите упростить выражение
[tex] (\frac{x-y}{x+y} - \frac{x+y}{x-y}) : \frac{4}{x^{2}- y^{2} } [/tex]
[tex] (\frac{x-y}{x+y} - \frac{x+y}{x-y}) : \frac{4}{x^{2}- y^{2} } [/tex]
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