$\int (\sqrt{\tan x} + \sqrt{\cot x}) \, dx = $

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

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