જો $\tan \theta = \frac{1}{3}$ હોય,તો $\cos 2 \theta = $

  • A
    $\frac{1}{4}$
  • B
    $\frac{1}{10}$
  • C
    $\frac{1}{5}$
  • D
    $\frac{4}{5}$

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