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[" 30."tan^(-1)x-tan^(-1)y=tan^(-1)((x-y...

[" 30."tan^(-1)x-tan^(-1)y=tan^(-1)((x-y)/(1+xy))" holds good for "],[[" (1) All "x,y in R],[" (2) "|x|<1,|y|<1],[" (3) "|x|>1,|y|>1],[" (4) "xy>-1]]

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