$\lim _{n \rightarrow \infty} \sum_{k=1}^n \frac{n^3}{(n^2+k^2)(n^2+3k^2)}$ का मान क्या है?

  • A
    $\frac{(2 \sqrt{3}+3) \pi}{24}$
  • B
    $\frac{13 \pi}{8(4 \sqrt{3}+3)}$
  • C
    $\frac{13(2 \sqrt{3}-3) \pi}{8}$
  • D
    $\frac{\pi}{8(2 \sqrt{3}+3)}$

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