$\int \frac{1}{\cos x(1 + \cos x)} \, dx = $

  • A
    $\log |\sec x + \tan x| + 2\tan \frac{x}{2} + c$
  • B
    $\log |\sec x + \tan x| - 2\tan \frac{x}{2} + c$
  • C
    $\log |\sec x + \tan x| + \tan \frac{x}{2} + c$
  • D
    $\log |\sec x + \tan x| - \tan \frac{x}{2} + c$

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