यदि $\int \frac{dx}{(x^2+9) \sqrt{x^2+16}} = \frac{1}{3 \sqrt{7}} \operatorname{Tan}^{-1} \left( K \frac{x}{\sqrt{16+x^2}} \right) + c$ है, तो $K=$

  • A
    $\frac{\sqrt{7}}{3}$
  • B
    $3 \sqrt{7}$
  • C
    $\frac{3}{\sqrt{7}}$
  • D
    $\frac{3}{7}$

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