જો $\tan 20^{\circ}=\lambda$ હોય,તો $\frac{\tan 160^{\circ}-\tan 110^{\circ}}{1+\left(\tan 160^{\circ}\right)\left(\tan 110^{\circ}\right)}$ ની કિંમત શોધો.

  • A
    $\frac{1+\lambda^2}{2 \lambda}$
  • B
    $\frac{1+\lambda^2}{\lambda}$
  • C
    $\frac{1-\lambda^2}{\lambda}$
  • D
    $\frac{1-\lambda^2}{2 \lambda}$

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જો $\tan \theta + \sin \theta = m$ અને $\tan \theta - \sin \theta = n$ હોય,તો

$\cos \frac{\pi}{7} - \cos \frac{2\pi}{7} + \cos \frac{3\pi}{7} - \cos \frac{4\pi}{7} + \cos \frac{5\pi}{7} - \cos \frac{6\pi}{7} = $

જો $0 < \theta < \frac{\pi}{4}$ અને $8 \cos \theta + 15 \sin \theta = 15$ હોય,તો $15 \cos \theta - 8 \sin \theta = $

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

$\cos^2 76^{\circ} + \cos^2 16^{\circ} - \cos 76^{\circ} \cos 16^{\circ}$ ની કિંમત શોધો.

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