If $\int \frac{dx}{\sqrt{2ax - x^2}} = f(g(x)) + c$, where $c$ is the constant of integration, then $f(x)$ and $g(x)$ are respectively equal to:

  • A
    $\sin^{-1} x, \frac{x - a}{a}$
  • B
    $\sin^{-1} x, \frac{x + a}{a}$
  • C
    $\tan^{-1} x, \frac{x - a}{a}$
  • D
    $\tan^{-1} x, \frac{x + a}{a}$

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