$\theta$ और $\alpha$ $Q_3$ में स्थित हैं। यदि $\cos (\theta-\alpha), \cos \theta, \cos (\theta+\alpha)$ हरात्मक श्रेणी में हैं,तो $\cos \theta \sec \frac{\alpha}{2} = $

  • A
    $-\sqrt{2}$
  • B
    $\sqrt{2}$
  • C
    $-\sqrt{3}$
  • D
    $\sqrt{3}$

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यदि $(\alpha+\beta)$,$\frac{\pi}{2}$ का गुणज नहीं है और $3 \sin (\alpha-\beta)=5 \cos (\alpha+\beta)$ है,तो $\tan \left(\frac{\pi}{4}+\alpha\right)+4 \tan \left(\frac{\pi}{4}+\beta\right)=$

$\sqrt{3} \csc 20^{\circ} - \sec 20^{\circ} = $

$\frac{\cos 13^{\circ}-\sin 13^{\circ}}{\cos 13^{\circ}+\sin 13^{\circ}}+\frac{1}{\cot 148^{\circ}}$ का मान ज्ञात कीजिए।

यदि $\sin 2\theta + \sin 2\phi = \frac{1}{2}$ और $\cos 2\theta + \cos 2\phi = \frac{3}{2}$ है,तो $\cos^2(\theta - \phi) =$

यदि $\sin \theta + \cos \theta = 1$ है,तो $\sin \theta \cos \theta = $

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