यदि $m \tan (\theta - 30^\circ) = n \tan (\theta + 120^\circ)$ है,तो $\frac{m + n}{m - n} = $

  • A
    $2 \cos 2\theta$
  • B
    $\cos 2\theta$
  • C
    $2 \sin 2\theta$
  • D
    $\sin 2\theta$

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

यदि $\cos \theta = \frac{3}{5}$ और $\cos \phi = \frac{4}{5}$ है,जहाँ $\theta$ और $\phi$ धनात्मक न्यून कोण हैं,तो $\cos \frac{\theta - \phi}{2} = $

$\tan\, 20^{\circ} + \tan\, 40^{\circ} + \sqrt{3}\, \tan\, 20^{\circ} \tan\, 40^{\circ}$ का मान क्या है?

सिद्ध कीजिए कि: $\sin 3x + \sin 2x - \sin x = 4 \sin x \cos \frac{x}{2} \cos \frac{3x}{2}$

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$\cos^2 48^{\circ} - \sin^2 12^{\circ}$ का मान ज्ञात कीजिए,यदि $\sin 18^{\circ} = \frac{\sqrt{5}-1}{4}$ है।

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