$\cos 52^\circ + \cos 68^\circ + \cos 172^\circ$ ની કિંમત શોધો.

  • A
    $0$
  • B
    $1$
  • C
    $2$
  • D
    $\frac{3}{2}$

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$\tan 20^{\circ} \tan 80^{\circ} \cot 50^{\circ}$ નું મૂલ્ય શોધો.

$\tan 81^{\circ}-\tan 63^{\circ}-\tan 27^{\circ}+\tan 9^{\circ}$ ની કિંમત શોધો.

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$\frac{1}{\sin 10^\circ} - \frac{\sqrt{3}}{\cos 10^\circ} =$

$\theta$ અને $\alpha$ એ $Q_3$ માં છે. જો $\cos (\theta-\alpha), \cos \theta, \cos (\theta+\alpha)$ હાર્મોનિક શ્રેણીમાં હોય,તો $\cos \theta \sec \frac{\alpha}{2} = $

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