$\int \cos 2\theta \log \left( \frac{\cos \theta + \sin \theta }{\cos \theta - \sin \theta } \right) d\theta = $

  • A
    $(\cos \theta - \sin \theta )^2 \log \left( \frac{\cos \theta + \sin \theta }{\cos \theta - \sin \theta } \right)$
  • B
    $(\cos \theta + \sin \theta )^2 \log \left( \frac{\cos \theta + \sin \theta }{\cos \theta - \sin \theta } \right)$
  • C
    $\frac{(\cos \theta - \sin \theta )^2}{2} \log \left( \frac{\cos \theta - \sin \theta }{\cos \theta + \sin \theta } \right)$
  • D
    $\frac{1}{2} \sin 2\theta \log \tan \left( \frac{\pi }{4} + \theta \right) - \frac{1}{2} \log \sec 2\theta $

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