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$\cos (270^\circ + \theta )\cos (90^\circ - \theta ) - \sin (270^\circ - \theta )\cos \theta $ का मान है

$\frac{\cos 10^{\circ} + \cos 80^{\circ}}{\sin 80^{\circ} - \sin 10^{\circ}} = ?$

यदि $x \neq 0$ है,तो $\frac{\sin (\pi+x) \cos (\frac{\pi}{2}+x) \tan (\frac{3 \pi}{2}-x) \cot (2 \pi-x)}{\sin (2 \pi-x) \cos (2 \pi+x) \operatorname{cosec}(-x) \sin (\frac{3 \pi}{2}+x)} = $

निम्नलिखित में से कौन सा संभव है?

यदि $\cos(\alpha + \beta) = 0$ है,तो $\sin(\alpha + 2\beta) =$

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