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

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

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સંખ્યા $\sum_{k=0}^{44} \frac{1}{\cos k^{\circ} \cos (k+1)^{\circ}}$ નો પૂર્ણાંક ભાગ શોધો.

$\cos ^2 10^{\circ}+\cos ^2 50^{\circ}-\sin 40^{\circ} \sin 80^{\circ}$ ની કિંમત શોધો.

સમીકરણ $\frac{\sin^3 \theta - \cos^3 \theta}{\sin \theta - \cos \theta} - \frac{\cos \theta}{\sqrt{1 + \cot^2 \theta}} - 2 \tan \theta \cot \theta = -1$ ક્યારે સાચું છે?

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