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$\sin \left(\frac{5 \pi}{3}\right) + \sec \left(\frac{13 \pi}{3}\right) = $

सिद्ध कीजिए कि $2 \sin ^{2} \frac{3 \pi}{4} + 2 \cos ^{2} \frac{\pi}{4} + 2 \sec ^{2} \frac{\pi}{3} = 10$.

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

$\tan 1^\circ \tan 2^\circ \tan 3^\circ \tan 4^\circ \dots \tan 89^\circ = $

यदि $\cosh x = \frac{\sqrt{14}}{3}$,$\sinh x = \cos \theta$ और $-\pi < \theta < -\frac{\pi}{2}$ है,तो $\sin \theta =$

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