Известно, что \frac{x+y}{x-y} + \frac{x-y}{x+y} =5. Найдите значение выражения \frac{x^{2} +y^{2} }{x^{2} -y^{2} } + \frac{x^{2} +y^{2} }{x^{2} -y^{2} }.
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