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यदि $\tan \beta = \cos \theta \tan \alpha$ है,तो ${\tan ^2}\frac{\theta }{2} = $

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।

श्रेणी $\sum_{n=1}^{\infty} \sin \left(\frac{n! \pi}{720}\right)$ का योग क्या है?

मान लीजिए $\frac{\pi}{2} < \theta < \pi$ और $\cot \theta = -\frac{1}{2 \sqrt{2}}$ है। तब $\sin (\frac{15 \theta}{2}) (\cos 8 \theta + \sin 8 \theta) + \cos (\frac{15 \theta}{2}) (\cos 8 \theta - \sin 8 \theta)$ का मान ज्ञात कीजिए:

$\cos^2 76^{\circ} + \cos^2 16^{\circ} - \cos 76^{\circ} \cos 16^{\circ}$ का मान ज्ञात कीजिए।

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