$\int x \sec^2 x \, dx = $

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

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