$\frac{\sin 81^o + \cos 81^o}{\sin 81^o - \cos 81^o}$ ની કિંમત શોધો.

  • A
    $\cot 9^o$
  • B
    $\tan 9^o$
  • C
    $\cot 54^o$
  • D
    $\tan 54^o$

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