જો $\cos x + \cos 2x + \ldots + \cos nx = \frac{A(x)}{2 \sin(x/2)}$ હોય, તો $\int_0^\pi A(x) dx =$

  • A
    $\frac{n^2}{n+1}$
  • B
    $\frac{-4n}{2n+1}$
  • C
    $\frac{2n}{2n+1}$
  • D
    $\frac{-n}{2n+1}$

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