$\int \tan ^{-1}(\sec x+\tan x) d x=$

  • A
    $\frac{\pi x}{4}+\frac{x^2}{4}+c$
  • B
    $\sin x \cos x+c$
  • C
    $\frac{\pi x}{2}+\frac{x^2}{2}+c$
  • D
    $\sin x+\cos x+c$

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