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Let f: (-1, 1) rarr B be a function defi...

Let f: (-1, 1) `rarr` B be a function defined by `(x)=tan^(-1) frac (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/4,pi/4]`.

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