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?
1x+y\frac{1}{x+y}x+y1
x−yx+y\frac{x-y}{x+y}x+yx−y
111
x+yx−y\frac{x+y}{x-y}x−yx+y