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सिद्ध कीजिए कि $\frac{\cos (\pi+x) \cos (-x)}{\sin (\pi-x) \cos (\frac{\pi}{2}+x)} = \cot^{2} x$.

$\sin ^4 \frac{\pi}{8} + \cos ^4 \frac{3 \pi}{8} - \sin ^4 \frac{3 \pi}{8} + \sin ^4 \frac{5 \pi}{8} + \cos ^4 \frac{7 \pi}{8} - \sin ^4 \frac{7 \pi}{8} = ?$

$\sin 18^{\circ}$ का मान क्या है?

यदि $\tan \theta = -\frac{4}{3}$ है,तो $\sin \theta = $

$\frac{1+\tanh \frac{x}{2}}{1-\tanh \frac{x}{2}}$ किसके बराबर है?

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