यदि $x$ वास्तविक है और $x+\frac{1}{x}=2 \cos \theta$ है,तो $\cos \theta=$

  • A
    $\pm \frac{1}{2}$
  • B
    $\pm \frac{1}{3}$
  • C
    $\pm 1$
  • D
    इनमें से कोई नहीं

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यदि $\sin \alpha = \frac{8}{17}, 0 < \alpha < 90^{\circ}$ और $\tan \beta = \frac{5}{12}, 0 < \beta < 90^{\circ}$ है,तो $\cos (\alpha - \beta)$ का मान ज्ञात कीजिए।

यदि $\tan \theta = \frac{p}{q}$ है,तो $\frac{p \sin \theta - q \cos \theta}{p \sin \theta + q \cos \theta} = $

यदि $\cos A = m \cos B$ है,तो

$\tan 20^\circ \tan 40^\circ \tan 60^\circ \tan 80^\circ = $

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