The function f:R to [-1/2, 1/2] defined ...

The function `f:R to [-1/2, 1/2]` defined as `f(x) = x/(1+x^2)` is

A

neither injective nor surjective.

B

invertible

C

injective but not surjective

D

surjective but not injective.

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The correct Answer is:

D

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