જો $\tan \theta_1 = k \cot \theta_2$ હોય,તો $\frac{\cos (\theta_1 + \theta_2)}{\cos (\theta_1 - \theta_2)} = $

  • A
    $\frac{1+k}{1-k}$
  • B
    $\frac{1-k}{1+k}$
  • C
    $\frac{k+1}{k-1}$
  • D
    $\frac{k-1}{k+1}$

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