If $\int \frac{1}{(1 + x)\sqrt{x}} \, dx = f(x) + A$,where $A$ is any arbitrary constant,then the function $f(x)$ is

  • A
    $2\tan^{-1}x$
  • B
    $2\tan^{-1}\sqrt{x}$
  • C
    $2\cot^{-1}\sqrt{x}$
  • D
    $\log_{e}(1 + x)$

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