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

  • A
    $-\log(1 + \cos^2 x) + c$
  • B
    $2\log(1 + \cos^2 x) + c$
  • C
    $\frac{1}{2}\log(1 + \cos 2x) + c$
  • D
    $-\log(1 + \sin^2 x) + c$

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