$\cos^2 \left( \frac{\pi}{6} + \theta \right) - \sin^2 \left( \frac{\pi}{6} - \theta \right) = $

  • A
    $\frac{1}{2} \cos 2\theta$
  • B
    $0$
  • C
    $-\frac{1}{2} \cos 2\theta$
  • D
    $\frac{1}{2}$

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જો $\cos \left( \frac{\alpha - \beta}{2} \right) = 2\cos \left( \frac{\alpha + \beta}{2} \right)$ આપેલ હોય,તો $\tan \frac{\alpha}{2} \tan \frac{\beta}{2}$ ની કિંમત શોધો.

જો $\pi < \alpha < \frac{3\pi}{2}$ હોય,તો $\sqrt{\frac{1 - \cos \alpha}{1 + \cos \alpha}} + \sqrt{\frac{1 + \cos \alpha}{1 - \cos \alpha}} = $

$\sin (\beta + \gamma - \alpha ) + \sin (\gamma + \alpha - \beta ) + \sin (\alpha + \beta - \gamma ) - \sin (\alpha + \beta + \gamma ) = $

$\frac{{\sin \theta }}{{1 - \cot \theta }} + \frac{{\cos \theta }}{{1 - \tan \theta }} = $

જો $\sin \theta_1 + \sin \theta_2 + \sin \theta_3 = 3$ હોય,તો $\cos \theta_1 + \cos \theta_2 + \cos \theta_3 =$

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