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Rational Expressionshard
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Simplify x+yx−y−x−yx+y1+x−yx+y\frac{\frac{x+y}{x-y} - \frac{x-y}{x+y}}{1 + \frac{x-y}{x+y}}1+x+yx−y​x−yx+y​−x+yx−y​​.