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If the function f: R -{1,-1} to A defind...

If the function `f: R -{1,-1} to A` definded by `f(x)=(x^(2))/(1-x^(2))`, is surjective, then A is equal to (A) `R-{-1}` (B) `[0,oo)` (C) `R-[-1,0)` (D) `R-(-1,0)`

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