$\tan \frac{\pi}{8}$ का मान ज्ञात कीजिए।

  • A
    $\sqrt{2} + 1$
  • B
    $\sqrt{2} - 1$
  • C
    $\sqrt{3} - 1$
  • D
    $\sqrt{3} + 1$

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यदि $\tan \alpha = \frac{-12}{5}$,$\cot \beta = \frac{7}{24}$,$\alpha$ दूसरे चतुर्थांश में नहीं है और $\beta$ पहले चतुर्थांश में नहीं है,तो $\sqrt{13} \sin \frac{\alpha}{2} + \cos \frac{\beta}{2} + \tan \frac{\alpha}{2} \cot \frac{\beta}{2} = $

$\cos \frac{\pi}{7} \cos \frac{2\pi}{7} \cos \frac{3\pi}{7} =$

यदि $A = 580^\circ$ है,तो निम्नलिखित में से कौन सा सत्य है?

$\cos ^3 \theta + \cos ^3(120^{\circ} + \theta) + \cos ^3(\theta - 120^{\circ}) = $

$(\sec 2A + 1)\sec^2 A = $

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