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[" Let "r:R rarr R" bedefined by "r(x)=(...

[" Let "r:R rarr R" bedefined by "r(x)=(x)/(1+x^(2))" ."x" e "R" .Then,"],[[" (a) "[-(1)/(2),(1)/(2)]," (b) "(-1,1)-(0)," (c) "R-[-(1)/(2)*(1)/(2)]]]

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