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Let f: R to R be defined by f(x)=(x)/(1...

Let `f: R to R ` be defined by `f(x)=(x)/(1+x^(2)), x in R.` Then, the range of f is (A) `[-(1)/(2),(1)/(2)]` (B) `(-1,1)-{0}` (C) `R-[-(1)/(2),(1)/(2)]` (D) `R-[-1,1]`

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