If "cos"theta=1/(sqrt(5)), where 0ltthet...

If `"cos"theta=1/(sqrt(5))`, where `0ltthetaltpi/(2)`, then `("2 tan"theta)/(1-"tan"^(2))theta)` is equal to

A

`4//3`

B

`-4//3`

C

`1//3`

D

`-2//3`

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