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\frac{1}{x - y}

\frac{1}{x + y}

2 - \frac{2}{x^{2} - y^{2}}

2 - \frac{2 x}{x^{2} - y^{2}}

\frac{2}{x^{2} - y^{2}}

\frac{2 x}{x^{2} - y^{2}} - 2

ANS : 4

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