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[" Let "f:(-1,1)rarr" B,be a function de...

[" Let "f:(-1,1)rarr" B,be a function defined by "f(x)=tan^(-1)(2x)/(1-x^(2))" ,then "f" is both one-one and onto when "B],[" is the interval- "],[[" (1) "[-(pi)/(2),(pi)/(2)]," (4) "(-(pi)/(2),(pi)/(2))," (3) "(0,(pi)/(2))," (4) "[0,(pi)/(2))]]

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