यदि किसी $x \in (\pi, \frac{3\pi}{2})$ के लिए $\cot x = \frac{5}{12}$ है, तो $\sin 7x(\cos \frac{13x}{2} + \sin \frac{13x}{2}) + \cos 7x(\cos \frac{13x}{2} - \sin \frac{13x}{2})$ का मान ज्ञात कीजिए।

  • A
    $\frac{4}{\sqrt{26}}$
  • B
    $\frac{6}{\sqrt{26}}$
  • C
    $\frac{1}{\sqrt{13}}$
  • D
    $\frac{5}{\sqrt{13}}$

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