यदि $x \sin \theta = y \sin \left( \theta + \frac{2\pi}{3} \right) = z \sin \left( \theta + \frac{4\pi}{3} \right)$ है,तो:

  • A
    $x + y + z = 0$
  • B
    $xy + yz + zx = 0$
  • C
    $xyz + x + y + z = 1$
  • D
    इनमें से कोई नहीं

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$\tan {20^\circ} + 2\tan {50^\circ} - \tan {70^\circ}$ का मान किसके बराबर है?

यदि $\sin \theta \cosh \alpha = \tan x$ और $\cos \theta \sinh \alpha = \sec x$ है,तो $\cos 2 \theta \cosh 2 \alpha$ का मान ज्ञात कीजिए।

$\cos ^3\left(\frac{\pi}{8}\right) \cos \left(\frac{3 \pi}{8}\right)+\sin ^3\left(\frac{\pi}{8}\right) \sin \left(\frac{3 \pi}{8}\right) = $

$\cos 2(\theta + \phi) - 4\cos (\theta + \phi)\sin \theta \sin \phi + 2\sin^2 \phi = $

$\frac{\cos 12^{\circ}-\sin 12^{\circ}}{\cos 12^{\circ}+\sin 12^{\circ}}+\frac{\sin 147^{\circ}}{\cos 147^{\circ}} = $

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