The vector `(veca+ 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 :

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

If vec a and vec b are two unit vectors such that vec a + 2 vec b and 5 vec a - 4 vec b are perpendicular to each other then the angle between vec a and vec b is

Let vec a, vec b and vec c of magnitudes 3,4 and 5 repectively. If vec a is perpendicular to (vec b + vec c), vec b is perpendicular to (vec c + vec a) and vec c is perpendicular to (vec a + vec b) , then the magnitude of vec a + vec b + vec c is

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 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 and vec b are vectors such that |vec a + vec b| = |vec a - vec b| , then the angle between vec a and vec b is