$\int(\cot x \cot (x+\alpha)+1) d x=$

  • A
    $\cot \alpha \log \left|\frac{\sin x}{\sin (x+\alpha)}\right|+c$
  • B
    $\log |\sin x \sin (x+\alpha)|+x+c$
  • C
    $\log |\sin x \cos (x+\alpha)|+x+c$
  • D
    $\tan \alpha \log \left|\frac{\cos x}{\sin (x+\alpha)}\right|+c$

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