$\int \frac{1-\cos x}{1+\cos x} d x=$ . . . . . . $+C$.

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

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