$4 \cos \frac{7 \theta}{2} \cos \frac{3 \theta}{2} \sin 5 \theta = $

  • A
    $\sin 10 \theta + \sin 7 \theta - \sin 3 \theta$
  • B
    $\sin 10 \theta + \sin 7 \theta - \sin 5 \theta$
  • C
    $\sin 10 \theta + \sin 7 \theta + \sin 3 \theta$
  • D
    $\sin 10 \theta + \sin 7 \theta + \sin 5 \theta$

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यदि $\sin \theta + \sin^2 \theta = 1$ और $\cos^{12} \theta + a \cos^{10} \theta + b \cos^8 \theta + c \cos^6 \theta + d = 0$ है,तो:

मान लीजिए $S = \left\{ \theta \in \left( 0, \frac{\pi}{2} \right) : \sum_{m=1}^{9} \sec \left( \theta + (m-1) \frac{\pi}{6} \right) \sec \left( \theta + \frac{m \pi}{6} \right) = -\frac{8}{\sqrt{3}} \right\}$. तो:

$\cos \frac{\pi}{7} \cos \frac{2\pi}{7} \cos \frac{3\pi}{7}$ का मान है

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यदि $\operatorname{cosec} \theta = \frac{p+q}{p-q}$ है,तो $\cot \left(\frac{\pi}{4} + \frac{\theta}{2}\right)$ का मान ज्ञात कीजिए।

यदि $A = \frac{\sin 3^\circ}{\cos 9^\circ} + \frac{\sin 9^\circ}{\cos 27^\circ} + \frac{\sin 27^\circ}{\cos 81^\circ}$ और $B = \tan 81^\circ - \tan 3^\circ$ है, तो $\frac{B}{A}$ का मान . . . . . . है।

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