જો $2 \cos \theta + \sin \theta = 1$ $\left( \theta \neq \frac{\pi}{2} \right)$ હોય,તો $7 \cos \theta + 6 \sin \theta$ ની કિંમત શોધો.

  • A
    $1/2$
  • B
    $46/5$
  • C
    $11/2$
  • D
    $2$

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જો $\operatorname{cosec}^2(\alpha+\beta)-\sin^2(\beta-\alpha)+\sin^2(2\alpha-\beta)=\cos^2(\alpha-\beta)$ જ્યાં $\alpha, \beta \in (0, \frac{\pi}{2})$ હોય,તો $\sin(\alpha-\beta)$ ની કિંમત શોધો.

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

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