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 $\cos x = -\frac{1}{3}$ અને $x$ એ $III$ ચરણમાં હોય,તો $\sin \frac{x}{2}, \cos \frac{x}{2}$ અને $\tan \frac{x}{2}$ શોધો.

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જો $\frac{\tan 3A}{\tan A} = a$ હોય,તો $\frac{\sin 3A}{\sin A}$ ની કિંમત શોધો.

સાબિત કરો કે $\frac{\sin 5x - 2\sin 3x + \sin x}{\cos 5x - \cos x} = \tan x$.

$\tan A + 2 \tan 2A + 4 \tan 4A + 8 \cot 8A = $

$\cos^3 \frac{\pi}{8} \cos \frac{3\pi}{8} + \sin^3 \frac{\pi}{8} \sin \frac{3\pi}{8} = $

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