यदि $\tan ^{-1}\left[\frac{1}{1+1 \cdot 2}\right]+\tan ^{-1}\left[\frac{1}{1+2 \cdot 3}\right]+\cdots+\tan ^{-1}\left[\frac{1}{1+n(n+1)}\right]=\tan ^{-1}[x]$ है,तो $x=$

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

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