If x and y are positive real numbers and x > y, then[m][fraction] [squ

If x and y are positive real numbers and x > y, then\(\frac \sqrtx^8 – 2 x^4 y^4 + y^8(x+y)^2 2xy\) = (A) x + y (B) x – y (C)\( x^2 + y^2\) (D) \(x^2 – y^2\) (E) \(x^4 – y^4\)