$\cos 2(\theta + \phi) - 4\cos (\theta + \phi)\sin \theta \sin \phi + 2\sin^2 \phi = $

  • A
    $\cos 2\theta$
  • B
    $\cos 3\theta$
  • C
    $\sin 2\theta$
  • D
    $\sin 3\theta$

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