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

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

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