$\int \frac{1}{1 + \cos^2 x} dx = $

  • A
    $\frac{1}{\sqrt{2}} \tan^{-1}(\tan x) + c$
  • B
    $\frac{1}{\sqrt{2}} \tan^{-1}\left( \frac{1}{2} \tan x \right) + c$
  • C
    $\frac{1}{\sqrt{2}} \tan^{-1}\left( \frac{1}{\sqrt{2}} \tan x \right) + c$
  • D
    इनमें से कोई नहीं

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