यदि $\tan A = \frac{1}{2}$ और $\tan B = \frac{1}{3}$ है,तो $\cos 2A = $

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

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