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

  • A
    $\frac{1}{\sqrt{2}} \tan^{-1}(\sqrt{2} \tan x) + k$
  • B
    $\sqrt{2} \tan^{-1}(\sqrt{2} \tan x) + k$
  • C
    $-\frac{1}{\sqrt{2}} \tan^{-1}(\sqrt{2} \tan x) + k$
  • D
    $-\sqrt{2} \tan^{-1}(\sqrt{2} \tan x) + k$

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