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 $\sin \alpha = 1/\sqrt{5}$ और $\sin \beta = 3/5$ है,तो $\beta - \alpha$ किस अंतराल में स्थित है?

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यदि $\cos \alpha + \cos \beta = \frac{1}{3}$ और $\sin \alpha + \sin \beta = \frac{1}{4}$ है,तो $\cos (\alpha + \beta) = $

यदि $\tan \left( \frac{\pi }{4} + \theta \right) + \tan \left( \frac{\pi }{4} - \theta \right) = \lambda \sec 2\theta$ है,तो $\lambda$ =

सिद्ध कीजिए कि $\frac{\sin (x+y)}{\sin (x-y)} = \frac{\tan x + \tan y}{\tan x - \tan y}$.

यदि $(1+\tan \alpha)(1+\tan 4 \alpha)=2$ और $\alpha \in \left(0, \frac{\pi}{16}\right)$ है,तो $\alpha$ का मान ज्ञात कीजिए।

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