यदि $\frac{5 \sinh 2x}{7+6 \cosh 2x} = \frac{3}{2}$ है,तो $3 \tanh^2 x + 20 \tanh x = $

  • A
    $13$
  • B
    $26$
  • C
    $39$
  • D
    $\frac{13}{2}$

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व्यंजक $\tan 9^{\circ}-\tan 27^{\circ}-\tan 63^{\circ}+\tan 81^{\circ}$ का मान ज्ञात कीजिए।

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