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[" Let "f:R rarr R" be defined by "f(x)=x^(2)-(x^(2))/(1+x^(2))" for all "x" e "R" .Then "],[[" (A) "f" is one - one but not onto mapping "," (B) "" fis onto but not one- - one mapping "],[" (C) "f" is both one - one and onto "," (B) "f" is oneither one - one nor ont "]]

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