જો $\operatorname{Tan}^{-1}\left[\frac{1}{1+1(2)}\right]+\operatorname{Tan}^{-1}\left[\frac{1}{1+(2)(3)}\right]+\operatorname{Tan}^{-1}\left[\frac{1}{1+(3)(4)}\right]+\cdots+\operatorname{Tan}^{-1}\left[\frac{1}{1+n(n+1)}\right]=\operatorname{Tan}^{-1} \theta$ હોય,તો $\theta=$

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

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સાબિત કરો કે $\tan ^{-1} \frac{1}{2}+\tan ^{-1} \frac{2}{11}=\tan ^{-1} \frac{3}{4}$

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