यदि $\tan \alpha = \frac{1}{7}$ और $\tan \beta = \frac{1}{3}$ है,तो $\cos 2\alpha = $

  • A
    $\sin 2\beta$
  • B
    $\sin 4\beta$
  • C
    $\sin 3\beta$
  • D
    इनमें से कोई नहीं

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