$2 \sin^2 \beta + 4 \cos(\alpha + \beta) \sin \alpha \sin \beta + \cos 2(\alpha + \beta) = $

  • A
    $\sin 2\alpha$
  • B
    $\cos 2\beta$
  • C
    $\cos 2\alpha$
  • D
    $\sin 2\beta$

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