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[tex] \frac{1}{ x^{2} } + \frac{x-2}{x} [/tex]
[tex] \frac{2mn}{ m^{2} + n^{2} } + \frac{2m}{ m^{2} - n^{2} } - \frac{1}{m-n} [/tex]
[tex] \frac{1}{ x^{2} } + \frac{x-2}{x} [/tex]
[tex] \frac{2mn}{ m^{2} + n^{2} } + \frac{2m}{ m^{2} - n^{2} } - \frac{1}{m-n} [/tex]
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