यदि $\int \frac{1}{(x^{2} + 4)(x^{2} + 9)} dx = A \tan^{-1} \frac{x}{2} + B \tan^{-1} \left( \frac{x}{3} \right) + C$ है,तो $A - B =$

  • A
    $\frac{1}{6}$
  • B
    $\frac{1}{30}$
  • C
    $-\frac{1}{30}$
  • D
    $-\frac{1}{6}$

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