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

  • A
    $2 \log \left|\sin \frac{x}{2}\right|+c$
  • B
    $2 \log \left|\cos \frac{x}{2}\right|+c$
  • C
    $\log \left|\sin \frac{x}{2}+\cos \frac{x}{2}\right|+c$
  • D
    $2 \log |\sin x+\cos x|+c$

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