यदि $\tan A = \frac{5}{6}$ और $\tan B = \frac{1}{11}$ है,तो $A + B = $

  • A
    $\frac{-\pi}{4}$
  • B
    $\frac{-\pi}{3}$
  • C
    $\frac{\pi}{3}$
  • D
    $\frac{\pi}{4}$

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

यदि $\theta \in \left(0, \frac{\pi}{2}\right)$ के लिए $\tan 3\theta \cdot \tan 2\theta \cdot \tan \theta + \tan 2\theta + \tan \theta = 1$ है,तो $\theta =$

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