જો $\sec(\theta+\alpha)$,$\sec\theta$,અને $\sec(\theta-\alpha)$ સમાંતર શ્રેણીમાં હોય,તો $\cos\theta \cdot \sec\frac{\alpha}{2}$ ની કિંમત શોધો.

  • A
    $\frac{\sqrt{3}}{2}$
  • B
    $\frac{1}{\sqrt{2}}$
  • C
    $\pm 2$
  • D
    $\pm \sqrt{2}$

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$\tan 1^{\circ}, \tan 2^{\circ}, \ldots, \tan 89^{\circ}$ નો ગુણોત્તર મધ્યક (geometric mean) શોધો.

જો $\tan A + \cot A = 4$ હોય,તો $\tan^4 A + \cot^4 A$ ની કિંમત કેટલી થાય?

$\tan 2 \alpha \cdot \tan \left(30^{\circ}-\alpha\right)+\tan 2 \alpha \cdot \tan \left(60^{\circ}-\alpha\right)+\tan \left(60^{\circ}-\alpha\right) \cdot \tan \left(30^{\circ}-\alpha\right)$ ની કિંમત શું થાય?

$\cos(18^{\circ}-A) \cdot \cos(18^{\circ}+A) - \cos(72^{\circ}-A) \cdot \cos(72^{\circ}+A)$ ની કિંમત શોધો.

$\cos 20^{\circ} \cos 40^{\circ} \cos 60^{\circ} \cos 80^{\circ} = $

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