ગણ $S = \{\theta \in [-4\pi, 4\pi] : 3 \cos^2 2\theta + 6 \cos 2\theta - 10 \cos^2 \theta + 5 = 0\}$ માં ઘટકોની સંખ્યા કેટલી છે?

  • A
    $32$
  • B
    $33$
  • C
    $34$
  • D
    $35$

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

જો $\cos x + \cos y - \cos (x + y) = \frac{3}{2}$ હોય,તો

જો $0 < \theta < \frac{\pi}{2}$ અને $\tan 3 \theta \neq 0$ હોય, તો $\tan \theta + \tan 2 \theta + \tan 3 \theta = 0$ થાય જો $\tan \theta \cdot \tan 2 \theta = k$ હોય, જ્યાં $k =$

${\left( \frac{\cos A + \cos B}{\sin A - \sin B} \right)^n} + {\left( \frac{\sin A + \sin B}{\cos A - \cos B} \right)^n}$ ($n$ એ પૂર્ણાંક છે) $=$

$\sum_{k=0}^4 \sin^2 \left( (2k+1) \frac{\pi}{20} \right) =$

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