Simplify xx+y+yx−y1−xx+y\frac{\frac{x}{x+y} + \frac{y}{x-y}}{1 - \frac{x}{x+y}}1−x+yxx+yx+x−yy
x2+y2y(x−y)\frac{x^2+y^2}{y(x-y)}y(x−y)x2+y2
x2−y2xy\frac{x^2-y^2}{xy}xyx2−y2
x2+y2x(x−y)\frac{x^2+y^2}{x(x-y)}x(x−y)x2+y2
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