Q 1381834727.     Find the interval of monotonicity of the function:

`f(x) =(2x) /(1+x^2)`

A

decreases in `(1, oo)`

B

decreases in `(-oo, 1)`

C

increases in `(-1, 1)`

D

increases in `(1, oo)`

HINT

From the sign scheme for `f'(x)`
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