यदि $\frac{x^2}{(x^2 + a^2)(x^2 + b^2)} = k \left( \frac{a^2}{x^2 + a^2} - \frac{b^2}{x^2 + b^2} \right)$ है,तो $k =$

  • A
    $a^2 - b^2$
  • B
    $\frac{1}{a + b}$
  • C
    $\frac{1}{a - b}$
  • D
    $\frac{1}{a^2 - b^2}$

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