જો $\sin A+\sin B=\sqrt{3}(\cos B-\cos A)$ હોય,તો $\sin 3A+\sin 3B$ ની કિંમત શોધો.

  • A
    $0$
  • B
    $2$
  • C
    $1$
  • D
    $-1$

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ધારો કે $\alpha = \frac{1}{\sin 60^{\circ} \sin 61^{\circ}} + \frac{1}{\sin 62^{\circ} \sin 63^{\circ}} + \dots + \frac{1}{\sin 118^{\circ} \sin 119^{\circ}}$. તો $\left(\frac{\operatorname{cosec} 1^{\circ}}{\alpha}\right)^2$ ની કિંમત $....$ છે.

જો $\cos \alpha + \cos \beta = a$,$\sin \alpha + \sin \beta = b$ અને $\alpha - \beta = 2 \theta$ હોય,તો $\frac{\cos 3 \theta}{\cos \theta} = $

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

${\sin ^4}\frac{\pi }{8} + {\sin ^4}\frac{{3\pi }}{8} + {\sin ^4}\frac{{5\pi }}{8} + {\sin ^4}\frac{{7\pi }}{8} = $

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જો $\tan \left(\frac{\pi}{4}+\alpha\right)=\tan ^3\left(\frac{\pi}{4}+\beta\right)$ હોય,તો $\tan (\alpha+\beta) \cot (\alpha-\beta)=$

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