If ` vec a\ a n d\ vec b` be two unit vectors and `theta` is the angle between them. Then ` vec a+ vec b\ ` is an unit vector, if `theta=` `pi/2` b. `(2pi)/3` c. `pi/4` d. `pi/3`

Let vec a . vec b be two unit vectors and theta is the angle between them. Then vec a + vec b is a unit vector if

Let vec(a) and vec(b) be two unit vectors and theta is the angle between them. Then vec(a)+vec(b) is a unit vector if :

Let vec a\ a n d\ vec b be two unit vectors and alpha be the angle between them, then vec a+ vec b is a unit vectors, if

Let vec(a) and vec(b) be two unit vectors and theta is the angle between them. Then vec(a)+vec(b) is a unit vector if ……….

If vec a and vec b be two unit vectors and theta is the angle between them.Then vec a+vec b is an unit vector,if theta=(pi)/(2) b.(2 pi)/(3) c.(pi)/(4) d.(pi)/(3)

If vec(a) and vec(b) are the unit vectors and theta is the angle between them, then vec(a) + vec(b) is a unit vector if

If vec a and vec b are two unit vectors and theta is the angle between them, then |vec a - vec b| is equal to ______________

If vec a and vec b are unit vectors and theta is the angle between them, show that (sin theta/2=1/2|vec a - vec b | .

Let vec a and vec b be two unit vectors and alpha be the angle between them,then vec a+vec b is a unit vectors,if alpha=(pi)/(4) b.alpha=(pi)/(3) c.alpha=(2 pi)/(3) d.alpha=(pi)/(2)

Let -> a and -> b be two unit vectors and is the angle between them. Then -> a+ -> b is a unit vector if (A) theta=pi/4 (B) theta=pi/3 (C) theta=pi/2 (D) theta=(2pi)/3