$\int \frac{dx}{5 + 4\cos x} = $

  • A
    $\frac{2}{3}\tan^{-1}\left( \frac{1}{3}\tan x \right) + c$
  • B
    $\frac{1}{3}\tan^{-1}\left( \frac{1}{3}\tan x \right) + c$
  • C
    $\frac{2}{3}\tan^{-1}\left( \frac{1}{3}\tan \frac{x}{2} \right) + c$
  • D
    $\frac{1}{3}\tan^{-1}\left( \frac{1}{3}\tan \frac{x}{2} \right) + c$

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