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

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

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