$\int_0^{\pi /2} {x\cot x\,dx} $ का मान ज्ञात कीजिए।

  • A
    $ - \frac{\pi }{2}\log 2$
  • B
    $\frac{\pi }{2}\log 2$
  • C
    $\pi \log 2$
  • D
    $ - \pi \log 2$

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