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

  • A
    $1$
  • B
    $0$
  • C
    $-1$
  • D
    इनमें से कोई नहीं

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यदि $\sin \theta = \sin 15^{\circ} + \sin 45^{\circ}$,जहाँ $0^{\circ} < \theta < 180^{\circ}$ है,तो $\theta =$ ($^{\circ}$ में)

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)

यदि $A + B = \frac{\pi}{4}$ है,तो $(1 + \tan A)(1 + \tan B) = $

$\cos(18^{\circ}-A) \cos(18^{\circ}+A) - \cos(72^{\circ}-A) \cos(72^{\circ}+A)$ का मान किसके बराबर है?

यदि $\theta$ और $\phi$ $1^{st}$ चतुर्थांश में ऐसे कोण हैं कि $\tan \theta = 1/7$ और $\sin \phi = 1/\sqrt{10}$ है,तो:

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