यदि $A$ तीसरे चतुर्थांश में है और $\tan A = \frac{\sqrt{7}}{3}$ है,तो $18 - 16 \sin^2 \frac{A}{2} - 32 \sin \frac{A}{2} \sin \frac{5A}{2} = $

  • A
    -$6$
  • B
    $11$
  • C
    $5$
  • D
    $10$

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$\operatorname{sech}^{-1}(\sin \theta)$ किसके बराबर है?

यदि $\sum_{r=1}^{13} \left\{ \frac{1}{\sin \left(\frac{\pi}{4} + (r-1) \frac{\pi}{6}\right) \sin \left(\frac{\pi}{4} + \frac{r\pi}{6}\right)} \right\} = a\sqrt{3} + b$,जहाँ $a, b \in \mathbb{Z}$,तो $a^2 + b^2$ का मान ज्ञात कीजिए:

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