Which of the following is equivalent to x2n−y2nxn−yn\frac{x^{2n} - y^{2n}}{x^n - y^n}xn−ynx2n−y2n (assume xn≠ynx^n \neq y^nxn=yn)?
xn+ynx^n + y^nxn+yn
xn−ynx^n - y^nxn−yn
x2n+y2nx^{2n} + y^{2n}x2n+y2n
2xn2x^n2xn