જો $\cos \theta = \frac{8}{17}$ અને $\theta$ એ $1^{st}$ ચરણમાં હોય,તો $\cos (30^\circ + \theta) + \cos (45^\circ - \theta) + \cos (120^\circ - \theta)$ ની કિંમત શોધો.

  • A
    $\frac{23}{17} \left( \frac{\sqrt{3} - 1}{2} + \frac{1}{\sqrt{2}} \right)$
  • B
    $\frac{23}{17} \left( \frac{\sqrt{3} + 1}{2} + \frac{1}{\sqrt{2}} \right)$
  • C
    $\frac{23}{17} \left( \frac{\sqrt{3} - 1}{2} - \frac{1}{\sqrt{2}} \right)$
  • D
    $\frac{23}{17} \left( \frac{\sqrt{3} + 1}{2} - \frac{1}{\sqrt{2}} \right)$

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જો $A$ અને $B$ $(A > B)$ લઘુકોણ હોય,$\sin (A-B)=\frac{16}{65}$ અને $\sin B=\frac{5}{13}$ હોય,તો $\tan A+\cot A=$

$\cos \alpha \sin (\beta-\gamma) + \cos \beta \sin (\gamma-\alpha) + \cos \gamma \sin (\alpha-\beta)$ ની કિંમત શું થાય?

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