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

$\cos 1^{\circ} \cdot \cos 2^{\circ} \cdot \cos 3^{\circ} \dots \cos 179^{\circ} = $

$\cos 1^\circ + \cos 2^\circ + \cos 3^\circ + \dots + \cos 180^\circ = $

यदि $y = \log_e \tan \left(\frac{\pi}{4} + \frac{x}{2}\right)$ है,तो $\tanh \left(\frac{y}{2}\right) = $

त्रिकोणमितीय फलन $\sin \left(-\frac{11 \pi}{3}\right)$ का मान ज्ञात कीजिए।

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