If 0 lt theta lt (pi)/(2) and (y+1)/(1-y...

If `0 lt theta lt (pi)/(2) and (y+1)/(1-y) =sqrt((1+ sin theta)/( 1- sin theta)),` then y is equal to

A

`cot(theta/2)`

B

`tan(theta/2)`

C

`cot(theta/2)+tan(theta/2)`

D

`cot(theta/2)-tan(theta/2)`

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