If `tan^(-1) x + tan^(-1) y = (4pi)/(5)`, then ` cot^(-1) x + cot^(-1) y` equal to
Channel: Doubtnut
Date: 2020-01-19

If `tan^(-1) x + tan^(-1) y = (4pi)/(5)`, then ` cot^(-1) x + cot^(-1) y` equal to