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

  • A
    $\frac{3}{8}$
  • B
    $\frac{5}{8}$
  • C
    $\frac{3}{4}$
  • D
    $\frac{5}{4}$

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