$\int \operatorname{cosec}(x-a) \operatorname{cosec} x \, dx =$

  • A
    $\operatorname{cosec} a \cdot \log \left| \frac{\sin(x-a)}{\sin x} \right| + c$
  • B
    $\operatorname{cosec} a \cdot \log \left| \frac{\sin x}{\sin(x-a)} \right| + c$
  • C
    $\sin a \cdot \log \left| \frac{\sin(x-a)}{\sin x} \right| + c$
  • D
    $\operatorname{cosec} a \cdot \log | \sin(x-a) \sin x | + c$

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