$\int \sqrt{1+2 \cot x(\cot x+\operatorname{cosec} x)} \, dx = $

  • A
    $2 \log \left(\sin \frac{x}{2}\right)+C$
  • B
    $2 \log (\sin x)-\log (\operatorname{cosec} x+\cot x)+C$
  • C
    $\frac{1}{2} \log \left(\operatorname{cosec} \frac{x}{2}+\cot \frac{x}{2}\right)+C$
  • D
    $4 \log \cos \frac{x}{2}+C$

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