$\int \frac{x + 1}{\sqrt{1 + x^2}} dx = $

  • A
    $\sqrt{1 + x^2} + \tan^{-1} x + c$
  • B
    $\sqrt{1 + x^2} - \log \{ x + \sqrt{1 + x^2} \} + c$
  • C
    $\sqrt{1 + x^2} + \log \{ x + \sqrt{1 + x^2} \} + c$
  • D
    $\sqrt{1 + x^2} + \log (\sec x + \tan x) + c$

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