$\int \sec x \, dx = $

  • A
    $\log \tan \left( \frac{\pi}{4} + \frac{x}{2} \right) + c$
  • B
    $-\log (\sec x - \tan x) + c$
  • C
    $\log (\sec x - \tan x) + c$
  • D
    None of these

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