$n \in N$ માટે,જો $I_n = \int \frac{\sin nx}{\sin x} dx = \frac{2}{n-1} \sin(n-1)x + I_{n-2}$ અને $\int_0^\pi \frac{\sin nx}{\sin x} dx = \frac{k\pi}{2}$ હોય,તો $k =$

  • A
    $(-1)^n - 1$
  • B
    $1 - (-1)^n$
  • C
    $(-1)^n$
  • D
    $(-1)^{n+1}$

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