If ` vec c` is perpendicular to both ` vec a` and ` vec b` , then prove that it is perpendicular to both ` vec a+ vec b` and ` vec a` -` vec b` .

If vec(A) is perpendicular to vec(B) , then

If vec(c ) is the unit vector perpendicular to both the vector vec(a) and vec(b) , then what is another unit vector perpendicular to both the vectors vec(a) and vec(b) ?

If vec a,vec b are two vectors such that |vec a+vec b|=|vec b|, then prove that vec a+2vec b is perpendicular to vec a .

If vec a,vec b are two vectors such that |vec a+vec b|=|vec b|, then prove that vec a+2vec b is perpendicular to vec a .

If a vector vec a is perpendicular to two non- collinear vector vec b and vec c ,then vec a is perpendicular to every vector in the plane of vec b and vec c.

If a vector vec a is perpendicular to two non coplasnar vectors vec b and vec c ,then vec a is perpendicular to every vector in the plane of vec b and vec .

If vec a,vec b, are two vectors such that |vec a+vec b|=|vec a|, then prove that 2vec a+vec b is perpendicular to vec b .

If vec a+vec b is perpendicular to vec b and vec a+vec 2b is perpendicular to vec a then

The vector (vec a+3vec b) is perpendicular to (7vec a-5vec b) and (vec a-4vec b) is perpendicular to (7vec a-2vec b). The angle between vec a and vec b is:

The vector (vec a+3vec b) is perpendicular to (7vec a-5vec b) and (vec a-4vec b) is perpendicular to (7vec a-2vec b). The angle between vec a and vec b is :