If x = (sec^(2) theta - tan theta)/(sec^...

If `x = (sec^(2) theta - tan theta)/(sec^(2) theta + tan theta)`, then which one of the following is correct ?

A

`(1)/(3) lt x lt 3`

B

`x cancelin [(1)/(3), 3]`

C

`-3 lt x lt - (1)/(3)`

D

`(1)/(3) le x le 3`

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