यदि $\cosh(x) = \frac{5}{4}$ है,तो $\cosh(3x)$ का मान क्या होगा?

  • A
    $\frac{61}{16}$
  • B
    $\frac{63}{16}$
  • C
    $\frac{65}{16}$
  • D
    $\frac{61}{63}$

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यदि $\cos \theta = \frac{-3}{5}$ और $\pi < \theta < \frac{3\pi}{2}$ है,तो $\tan \frac{\theta}{2} + \sin \frac{\theta}{2} + 2 \cos \frac{\theta}{2} =$

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$2\cos x - \cos 3x - \cos 5x = $

$\cos \left(\frac{2 \pi}{7}\right) + \cos \left(\frac{4 \pi}{7}\right) + \cos \left(\frac{6 \pi}{7}\right)$ का मान ज्ञात कीजिए।

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