અનંત શ્રેણી $\cot ^{-1}\left(\frac{7}{4}\right)+\cot ^{-1}\left(\frac{19}{4}\right)+\cot ^{-1}\left(\frac{39}{4}\right)+\cot ^{-1}\left(\frac{67}{4}\right)+\ldots \ldots$ નો સરવાળો :-

  • A
    $\frac{\pi}{2}+\tan ^{-1}\left(\frac{1}{2}\right)$
  • B
    $\frac{\pi}{2}-\cot ^{-1}\left(\frac{1}{2}\right)$
  • C
    $\frac{\pi}{2}+\cot ^{-1}\left(\frac{1}{2}\right)$
  • D
    $\frac{\pi}{2}-\tan ^{-1}\left(\frac{1}{2}\right)$

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