If theta is the angle between unit vectors vec(A) and vec(B), then ((1-vec(A).vec(B)))/((1+vec(A).vec(B))) is equal to

If theta is the angle between unit vectors vec(A) and vec(B), then ((1

1.	If theta is the angle between unit vectors vec(A) and vec(B), then ((1-vec(A).vec(B)))/((1+vec(A).vec(B))) is equal to
Answer» `TAN^(2)(theta//2)` `SIN^(2)(theta//2)` `cot^(2)(theta//2)` `cos^(2)(theta//2)` ANSWER :A