Answer :

nobillionaireNobley
[tex] \frac{ \frac{1}{y} - \frac{1}{x} }{ \frac{1}{y} + \frac{1}{x} } = \frac{ \frac{x-y}{xy} }{ \frac{x+y}{xy} } = \frac{x-y}{x+y} [/tex]

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