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If theta is the angle between unit vecto...

If `theta` is the angle between unit vectors `bar(A)` and `bar(B)` then `(1-bar(A).bar(B))/(1+bar(A)*bar(B))` is equal to
(A) `tan^(2)((theta)/(2))` (B) `sin^(2)((theta)/(2))` (C) `cot^(2)((theta)/(2))` (D) `cos^(2)((theta)/(2))`

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