Which expression is equivalent to x3+y3x2−y2÷x2−xy+y2x−y\frac{x^3+y^3}{x^2-y^2} \div \frac{x^2-xy+y^2}{x-y}x2−y2x3+y3÷x−yx2−xy+y2?
x+yx−y\frac{x+y}{x-y}x−yx+y
x−yx+y\frac{x-y}{x+y}x+yx−y
1x+y\frac{1}{x+y}x+y1
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