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 $\theta =$

  • A
    $\frac{\pi}{12}$
  • B
    $\frac{\pi}{4}$
  • C
    $\frac{\pi}{6}$
  • D
    $\frac{\pi}{3}$

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$\cos ^4 \frac{\pi}{24} - \sin ^4 \frac{\pi}{24} = $

$\sin 75^{\circ}$ का मान ज्ञात कीजिए।

यदि $\cos (\alpha + \beta ) = \frac{4}{5}$,$\sin (\alpha - \beta ) = \frac{5}{13}$ और $\alpha, \beta$ का मान $0$ और $\frac{\pi}{4}$ के बीच है,तो $\tan 2\alpha = $

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