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\frac{m}{n}

\frac{n}{m}

\frac{m^{2} - n^{2}}{m n}

\frac{n^{2} - m^{2}}{m n}

\frac{m^{2} - n^{2}}{m n^{2}}

\frac{m^{2} + n^{2}}{m n}

ANS : 2

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