જો $\cos \theta = \frac{1}{2}\left( a + \frac{1}{a} \right)$ હોય,તો $\cos 3\theta$ ની કિંમત શોધો.

  • A
    $\frac{1}{8}\left( a^3 + \frac{1}{a^3} \right)$
  • B
    $\frac{3}{2}\left( a + \frac{1}{a} \right)$
  • C
    $\frac{1}{2}\left( a^3 + \frac{1}{a^3} \right)$
  • D
    $\frac{1}{3}\left( a^3 + \frac{1}{a^3} \right)$

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$\sin 4\theta$ ને કેવી રીતે લખી શકાય?

$\cos \left(\frac{\pi}{7}\right) \cos \left(\frac{2 \pi}{7}\right) \cos \left(\frac{4 \pi}{7}\right) = $

જો $\sin \theta = \frac{3}{5}$ અને $\theta$ પ્રથમ ચરણમાં નથી,તો $15 \sin 2 \theta - 20 \cos 2 \theta - 7 \tan 2 \theta = $

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

$2\sin A\cos^3 A - 2\sin^3 A\cos A = $

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