If sin theta = (m^(2) - n^(2))/(m^(2) + ...

If `sin theta = (m^(2) - n^(2))/(m^(2) + n^(2))` and `0 lt theta lt (pi)/(2)`, then what is the value of `cos theta` ?

A

`(2m n)/(m^(2) + n^(2))`

B

`(2mn)/(m^(2) - n^(2))`

C

`(m^(2) + n^(2))/(2mn)`

D

`(m^(2) - n^(2))/(2mn)`

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