यदि $\tan \theta = \frac{\cos 25^{\circ} + \sin 25^{\circ}}{\cos 25^{\circ} - \sin 25^{\circ}}$ और $\theta$ तीसरे चतुर्थांश में है,तो $\theta =$ ($^{\circ}$ में)

  • A
    $200$
  • B
    $205$
  • C
    $225$
  • D
    $250$

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सिद्ध कीजिए कि $\sin (n+1) x \sin (n+2) x + \cos (n+1) x \cos (n+2) x = \cos x$.

यदि $\tan \alpha = \frac{m}{m + 1}$ और $\tan \beta = \frac{1}{2m + 1}$ है,तो $\alpha + \beta = $

$\frac{1}{4} [\sqrt{3} \cos 23^\circ - \sin 23^\circ] = $

$\cos 15^{\circ} - \sin 15^{\circ}$ का मान है ......

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