$\theta$ के किसी भी वास्तविक मान के लिए $3 \cos \theta + 5 \sin \left( \theta - \frac{\pi}{6} \right)$ का अधिकतम मान क्या है?

  • A
    $\sqrt{19}$
  • B
    $\frac{\sqrt{79}}{2}$
  • C
    $\sqrt{34}$
  • D
    $\sqrt{31}$

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