જો $m \cdot \tan (\theta-30^{\circ})=n \cdot \tan (\theta+120^{\circ})$ હોય,તો $\frac{m+n}{m-n}=$

  • A
    $2 \cos 2 \theta$
  • B
    $2 \cos ^2 \theta$
  • C
    $\tan 2 \theta$
  • D
    $2 \sin 2 \theta$

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કિંમત શોધો: $\cos^2 76^\circ + \cos^2 16^\circ - \cos 76^\circ \cos 16^\circ$

ધારો કે $\frac{\pi}{2} < x < \pi$ એવું છે કે જેથી $\cot x = \frac{-5}{\sqrt{11}}$. તો $\left(\sin \frac{11x}{2}\right)(\sin 6x - \cos 6x) + \left(\cos \frac{11x}{2}\right)(\sin 6x + \cos 6x)$ ની કિંમત શોધો.

ધારો કે $\alpha, \beta$ બે વાસ્તવિક સંખ્યાઓ છે જેથી $\pi < (\alpha-\beta) < 3 \pi$. જો $\sin \alpha+\sin \beta=\frac{-21}{65}$ અને $\cos \alpha+\cos \beta=\frac{-27}{65}$ હોય,તો $\cos \left(\frac{\beta-\alpha}{2}\right)=$

પદાવલિ $\frac{\cos 6x + 6\cos 4x + 15\cos 2x + 10}{\cos 5x + 5\cos 3x + 10\cos x}$ ની કિંમત શોધો.

જો $\sum_{r=1}^{13} \left\{ \frac{1}{\sin \left(\frac{\pi}{4} + (r-1) \frac{\pi}{6}\right) \sin \left(\frac{\pi}{4} + \frac{r\pi}{6}\right)} \right\} = a\sqrt{3} + b$,જ્યાં $a, b \in \mathbb{Z}$,તો $a^2 + b^2$ ની કિંમત શોધો:

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