यदि $\sin 2\theta + \sin 2\phi = 1/2$ और $\cos 2\theta + \cos 2\phi = 3/2$ है,तो $\cos^2(\theta - \phi) = $

  • A
    $3/8$
  • B
    $5/8$
  • C
    $3/4$
  • D
    $5/4$

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