Let `vec(a), vec(b), vec(c)` are three unit vector such that `vec(a)+vec(b)+vec(c)` os also a unit vector. If pairwise angles between `vec(a), vec(b), vec(c)` are `theta_(1), theta_(2)` and `theta_(3)` respectively then `cos theta_(1)+cos theta_(2)+ cos theta_(3)` equals

Let vec(a), vec(b) and vec(c) be three vectors such that vec(a) = vec(b) xx ( vec(b) xx vec(c)) . If magnitudes of the vectors vec(a), vec(b) and vec(c) " are" sqrt(2) , 1 and 2 respectively and the angle between vec(b) and vec(c) " is " theta ( 0 lt theta lt (pi)/(2)) , then the value of 1 + tan theta is equal to :

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) are the 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 ……….

vec(a),vec(b) and vec( c ) are non zero vectors. (vec(a)xx vec(b))xx vec( c )=(1)/(3)|vec(b)||vec( c )|vec(a) . If the acute angle between the vectors vec(b) and vec( c ) is theta then sin theta = ……………

Let vec(a), vec(b) and vec(c) be three non-zero vectors such that no two of them are collinear and (vec(a) xx vec(b)) xx vec(c) = (1)/(3) |vec(b)||vec(c)| vec(a) . If theta is the angle between vector vec(b) and vec(c) , then a value of sin theta is

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

If vec a and vec b are unit vectors and theta is the angle between them, then |vec a + vec b| =