यदि $\int \frac{x}{(a+x)^5} dx = \frac{1}{k(a+x)^4}(f(x)) + c$ है, तो $\frac{f(-a)}{ak} = $

  • A
    $\frac{1}{3}$
  • B
    $\frac{1}{2}$
  • C
    $\frac{5}{6}$
  • D
    $\frac{1}{4}$

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