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[" If "tan^(-1)x+tan^(-1)y=(4 pi)/(5)" t...

[" If "tan^(-1)x+tan^(-1)y=(4 pi)/(5)" then "cot^(-1)x+cot^(-1)" y equals "],[[" a) "(3 pi)/(5)," b) "(pi)/(5)],[" c) "(2 pi)/(r)," d) "pi]]

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