જો $\cos \theta = \frac{1}{2}\left( a + \frac{1}{a} \right)$ હોય,તો $\cos 3\theta$ નું મૂલ્ય કેટલું થાય?

  • 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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કોઈપણ $\theta \in \left( \frac{\pi}{4}, \frac{\pi}{2} \right)$ માટે,પદાવલિ $3(\sin \theta - \cos \theta)^4 + 6(\sin \theta + \cos \theta)^2 + 4\sin^6 \theta$ ની કિંમત શું થાય?

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જો $A, B, C, D$ એ ચક્રીય ચતુષ્કોણના ખૂણાઓ હોય,તો $\cos A + \cos B + \cos C + \cos D = $

$\sin 4\theta$ ને કેવી રીતે લખી શકાય?

$\frac{(\tan 69^{\circ} + \tan 66^{\circ})}{(1 - \tan 69^{\circ} \tan 66^{\circ})}$ ની કિંમત શોધો.

જો $1+\cos^{2} \theta = 3 \sin \theta \cos \theta$ હોય,તો $\cot \theta$ નું પૂર્ણાંક મૂલ્ય $(0 < \theta < \frac{\pi}{2})$ શોધો.

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