Simplify x2−y2x3+y3⋅x2−xy+y2x−y\frac{x^2-y^2}{x^3+y^3} \cdot \frac{x^2-xy+y^2}{x-y}x3+y3x2−y2⋅x−yx2−xy+y2.
111
x−yx+y\frac{x-y}{x+y}x+yx−y
x+yx−y\frac{x+y}{x-y}x−yx+y
x+yx+yx+y