$\cot 12^{\circ} \cot 102^{\circ} + \cot 102^{\circ} \cot 66^{\circ} + \cot 66^{\circ} \cot 12^{\circ}$ का मान ज्ञात कीजिए।

  • A
    $-2$
  • B
    $1$
  • C
    $-1$
  • D
    $2$

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$\frac{\sin 1^{\circ}+\sin 2^{\circ}+\ldots+\sin 89^{\circ}}{2(\cos 1^{\circ}+\cos 2^{\circ}+\ldots+\cos 44^{\circ})+1} = $

यदि $\cosh 2x = 199$ है,तो $\coth x$ का मान ज्ञात कीजिए।

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