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.	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