$\sin^2 5^\circ + \sin^2 10^\circ + \sin^2 15^\circ + \dots + \sin^2 85^\circ + \sin^2 90^\circ$ ની કિંમત શોધો.

  • A
    $7$
  • B
    $8$
  • C
    $9$
  • D
    $9\frac{1}{2}$

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જો $\tan \theta + \cot \theta = 4$ હોય,તો $\tan^{4} \theta + \cot^{4} \theta = $

$\sqrt{3} \operatorname{cosec} 20^{\circ} - \sec 20^{\circ}$ ની કિંમત શોધો.

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