$\frac{\sin 81^\circ + \cos 81^\circ}{\sin 81^\circ - \cos 81^\circ}$ का मान ज्ञात कीजिए।

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

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