If $(x+iy) = \left(\frac{1+i}{1-i}\right)^3 - \left(\frac{1-i}{1+i}\right)^3$,then the true statement among the following is

  • A
    $x < y$
  • B
    $x > y$
  • C
    $x \neq 0$
  • D
    $x = y$

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