यदि $\cot \alpha = \frac{1}{2}$ और $\sec \beta = -\frac{5}{3}$,जहाँ $\alpha \in \left(\pi, \frac{3\pi}{2}\right)$ और $\beta \in \left(\frac{\pi}{2}, \pi\right)$ है,तो $\tan(\alpha + \beta)$ का मान ज्ञात कीजिए।

  • A
    $\frac{3}{11}$
  • B
    $\frac{22}{9}$
  • C
    $\frac{9}{11}$
  • D
    $\frac{2}{11}$

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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।

$\tan 15^{\circ}$ का मान ज्ञात कीजिए:

सिद्ध कीजिए कि $\cos \left( \frac{\pi}{4} + x \right) + \cos \left( \frac{\pi}{4} - x \right) = \sqrt{2} \cos x$.

$\sin 75^\circ = $

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