$f(x) = \frac{x}{1 + x^2}$ का एक आदि फलन (primitive) है:

  • A
    $\log_e(x^2 + 1)$
  • B
    $x \tan^{-1} x$
  • C
    $\frac{\log_e(x^2 + 1)}{2}$
  • D
    $\frac{1}{2} x \tan^{-1} x$

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