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

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

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