The function f(x) = (x)/(3) + (3)/(x) de...

The function `f(x) = (x)/(3) + (3)/(x)` decreases in the interval

A

`(-3,3)`

B

`(-oo, 3)`

C

`(3, oo)`

D

`(-9,9)`

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The correct Answer is:

A

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