Let $\frac{1 - ix}{1 + ix} = a - ib$ and $a^2 + b^2 = 1$,where $a$ and $b$ are real,then $x = $

  • A
    $\frac{2a}{(1 + a)^2 + b^2}$
  • B
    $\frac{2b}{(1 + a)^2 + b^2}$
  • C
    $\frac{2a}{(1 + b)^2 + a^2}$
  • D
    $\frac{2b}{(1 + b)^2 + a^2}$

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