જો $\sin 3\alpha = 4 \sin \alpha \cdot \sin(x + \alpha) \cdot \sin(x - \alpha)$ જ્યાં $\alpha \neq n\pi, n \in Z$, તો $x$ ના તમામ શક્ય મૂલ્યો છે

  • A
    $x = n\pi \pm \frac{\pi}{3}, n \in Z$
  • B
    $x = n\pi \pm \frac{\pi}{4}, n \in Z$
  • C
    $x = n\pi \pm \frac{\pi}{6}, n \in Z$
  • D
    $x = n\pi \pm \frac{\pi}{2}, n \in Z$

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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 $k =$

કિંમત શોધો: $\sin ^2 18^{\circ}+\sin ^2 24^{\circ}+\sin ^2 36^{\circ}+\sin ^2 42^{\circ}+\sin ^2 78^{\circ}+\sin ^2 90^{\circ}+\sin ^2 96^{\circ}+\sin ^2 102^{\circ}+\sin ^2 138^{\circ}+\sin ^2 162^{\circ}$

જો $\frac{3\pi}{4} < \alpha < \pi$ હોય,તો $\sqrt{\csc^2 \alpha + 2\cot \alpha}$ ની કિંમત કેટલી થાય?

$\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} = $

$\tan 81^{\circ}-\tan 63^{\circ}-\tan 27^{\circ}+\tan 9^{\circ}$ ની કિંમત શોધો.

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