$\int\limits_0^\pi {\frac{{\sin \left( {n + \frac{1}{2}} \right)x}}{{\sin \frac{x}{2}}}} \,dx$,$(n \in N)$ का मान ज्ञात कीजिए।

  • A
    $n\pi $
  • B
    $(2n + 1)\frac{\pi }{2}$
  • C
    $\pi $
  • D
    $0$

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