यदि $A + C = B$ है,तो $\tan A \tan B \tan C = $

  • A
    $\tan A \tan B + \tan C$
  • B
    $\tan B - \tan C - \tan A$
  • C
    $\tan A + \tan C - \tan B$
  • D
    $ - (\tan A \tan B + \tan C)$

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मान लीजिए $\tan \alpha = \frac{a}{a+1}$ और $\tan \beta = \frac{1}{2a+1}$, तो $\alpha + \beta$ का मान क्या है?

यदि $2 \sin \left(\theta+\frac{\pi}{3}\right)=\cos \left(\theta-\frac{\pi}{6}\right)$ है,तो $\tan \theta=$

$\cos 48^{\circ} \cdot \cos 12^{\circ} = ?$

सिद्ध कीजिए कि: $2 \cos \frac{\pi}{13} \cos \frac{9 \pi}{13} + \cos \frac{3 \pi}{13} + \cos \frac{5 \pi}{13} = 0$

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$\cos ^2\left(\frac{\pi}{6}+\theta\right)-\sin ^2\left(\frac{\pi}{6}-\theta\right)$ का मान ज्ञात कीजिए।

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