$\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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