For vectors `vec(A) and vec(B)` making an angle `theta` which one of the following relation is correct?

If the vector vec(a) lies in the planar of vectors vec(b) and vec(c ) , then which one of the following is correct?

The angle between two vectors vec(A) and vec(B) is theta . The resultant of these vectors vec(R ) makes an angle of theta//2 with A. which of the following is true?

If vec(a) and vec(b) are two unit vectors inclined at an angle 60^(@) to each other, then which one of the following is correct?

If vec(a) and vec(b) are two vectors such that vec(a).vec(b) = 0 and vec(a) xx vec(b) = 0 , then which one of the following is correct?

If vec(A) and vec(B) are two vectors, which of the following is not correct?

If vec(a) and vec(b) are unit vectors inclined at an angle of 30^(@) to each other, then which one of the following is correct?

The vector vec(a) lies in the plane of vectors vec(b) and vec(c) . Which one of the following is correct ?

If vec(a)xx vec(b) = vec(c) and vec(b) xx vec(c) = vec(a) , then which one of the following is correct?