નીચેનામાંથી કઈ નિત્યસમ સાચી છે?

  • A
    $\cos 5 \theta = 16 \cos ^5 \theta - 20 \cos ^3 \theta - 5 \cos \theta$
  • B
    $\cos 5 \theta = 20 \cos ^3 \theta - 16 \cos ^5 \theta + 5 \cos \theta$
  • C
    $\cos 5 \theta = 16 \cos ^5 \theta + 20 \cos ^3 \theta - 5 \cos \theta$
  • D
    $\cos 5 \theta = 16 \cos ^5 \theta - 20 \cos ^3 \theta + 5 \cos \theta$

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જો $x \in \left(-\frac{\pi}{2}, \frac{\pi}{2}\right)$ હોય,તો $\log \sec x = $

જો $\tan \theta = t$ હોય,તો $\tan 2\theta + \sec 2\theta = $

જો $630^{\circ} < \theta < 810^{\circ}$ અને $\tan \theta = -\frac{7}{24}$ હોય,તો $\cos \left(\frac{\theta}{4}\right) = $

$\tan \left(\frac{\pi}{8}\right)$ નું મૂલ્ય શું છે?

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