$\int \frac{1 + \tan x \tan(x + a)}{\tan x \tan(x + a)} dx =$

  • A
    $\tan a (\log(\sec(x + a)) + \log \sec x + C)$
  • B
    $\cot a (\log |\sin x| - \log |\sin(x + a)|) + C$
  • C
    $\tan a (\log (\frac{\cos x}{\sin(x + a)})) + C$
  • D
    $\cot a (\log \frac{\sin(x + a)}{\cos(x + a)}) + C$

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