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

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

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