$\int \frac{d x}{4+5 \cos x} = $

  • A
    $-\frac{1}{3} \log \left|\frac{3+\tan \frac{x}{2}}{3-\tan \frac{x}{2}}\right|+C$
  • B
    $\frac{1}{3} \log \left|\frac{3+\tan \frac{x}{2}}{3-\tan \frac{x}{2}}\right|+C$
  • C
    $-\frac{1}{9} \log \left|\frac{3-\tan \frac{x}{2}}{3+\tan \frac{x}{2}}\right|+C$
  • D
    $\frac{1}{9} \log \left|\frac{3-\tan \frac{x}{2}}{3+\tan \frac{x}{2}}\right|+C$

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