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Let f:(-1,1)rarrB be a function defined...

Let `f:(-1,1)rarrB` 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. (a)`[0,pi/2)` (b) `(0,pi/2)` (c)`(-pi/2,pi/2)` (d) `[-pi/2,pi/2]`

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