If tan\ theta/2=(cosec theta-sin theta),...

If `tan\ theta/2=(cosec theta-sin theta),` then `tan^2\ theta/2` may be equal to (A) `2-sqrt(5)` (B) `(9-4sqrt(5))(2+sqrt(5))` (C) `-2+sqrt(5)` (D) `(9-4sqrt(5))(2-sqrt(5))`

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