જો $\int \frac{d x}{\left(x^{2}+x+1\right)^{2}}=a \tan ^{-1}\left(\frac{2 x+1}{\sqrt{3}}\right)+b\left(\frac{2 x+1}{x^{2}+x+1}\right)+C$ જ્યાં $x>0$ અને $C$ એ સંકલનનો અચળાંક છે,તો $9(\sqrt{3} a+b)$ ની કિંમત શોધો.

  • A
    $13$
  • B
    $15$
  • C
    $17$
  • D
    $8$

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