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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