જો $\tan ^{-1} x+\tan ^{-1} y=\frac{4 \pi}{5}$ હોય,તો $\cot ^{-1} x+\cot ^{-1} y$ ની કિંમત શોધો.

  • A
    $ \frac{\pi}{5} $
  • B
    $ \frac{2 \pi}{5} $
  • C
    $ \frac{3 \pi}{5} $
  • D
    $ \frac{4 \pi}{5} $

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