$\int {\frac{{\cos x - 1}}{{\cos x + 1}}\,dx} = $

  • A
    $2\tan \frac{x}{2} - x + c$
  • B
    $\frac{1}{2}\tan \frac{x}{2} - x + c$
  • C
    $x - \frac{1}{2}\tan \frac{x}{2} + c$
  • D
    $x - 2\tan \frac{x}{2} + c$

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