MCQ
If `tan^-1x + tan^-1y = (4pi)/5`, then `cot^-1x + cot^-1y` equals ______.
  • A
    `(2pi)/5`
  • B
    π
  • `pi/5`
  • D
    `(3pi)/5`

Answer

Correct option: C.
`pi/5`
C

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