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:

  • A
    $10$
  • B
    $2$
  • C
    $8$
  • D
    $4$

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જો $\cos(\theta - \alpha) = a$ અને $\sin(\theta - \beta) = b$ હોય, તો $\cos^2(\alpha - \beta) + 2ab \sin(\alpha - \beta) + \cos^2(\theta - \alpha)$ ની કિંમત શું થાય?

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